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- How to Write a Literature Review | Guide, Examples, & Templates
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How to Write a Literature Review | Guide, Examples, & Templates
Published on January 2, 2023 by Shona McCombes . Revised on September 11, 2023.
What is a literature review? A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research that you can later apply to your paper, thesis, or dissertation topic .
There are five key steps to writing a literature review:
- Search for relevant literature
- Evaluate sources
- Identify themes, debates, and gaps
- Outline the structure
- Write your literature review
A good literature review doesn’t just summarize sources—it analyzes, synthesizes , and critically evaluates to give a clear picture of the state of knowledge on the subject.
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Table of contents
What is the purpose of a literature review, examples of literature reviews, step 1 – search for relevant literature, step 2 – evaluate and select sources, step 3 – identify themes, debates, and gaps, step 4 – outline your literature review’s structure, step 5 – write your literature review, free lecture slides, other interesting articles, frequently asked questions, introduction.
- Quick Run-through
- Step 1 & 2
When you write a thesis , dissertation , or research paper , you will likely have to conduct a literature review to situate your research within existing knowledge. The literature review gives you a chance to:
- Demonstrate your familiarity with the topic and its scholarly context
- Develop a theoretical framework and methodology for your research
- Position your work in relation to other researchers and theorists
- Show how your research addresses a gap or contributes to a debate
- Evaluate the current state of research and demonstrate your knowledge of the scholarly debates around your topic.
Writing literature reviews is a particularly important skill if you want to apply for graduate school or pursue a career in research. We’ve written a step-by-step guide that you can follow below.
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Writing literature reviews can be quite challenging! A good starting point could be to look at some examples, depending on what kind of literature review you’d like to write.
- Example literature review #1: “Why Do People Migrate? A Review of the Theoretical Literature” ( Theoretical literature review about the development of economic migration theory from the 1950s to today.)
- Example literature review #2: “Literature review as a research methodology: An overview and guidelines” ( Methodological literature review about interdisciplinary knowledge acquisition and production.)
- Example literature review #3: “The Use of Technology in English Language Learning: A Literature Review” ( Thematic literature review about the effects of technology on language acquisition.)
- Example literature review #4: “Learners’ Listening Comprehension Difficulties in English Language Learning: A Literature Review” ( Chronological literature review about how the concept of listening skills has changed over time.)
You can also check out our templates with literature review examples and sample outlines at the links below.
Download Word doc Download Google doc
Before you begin searching for literature, you need a clearly defined topic .
If you are writing the literature review section of a dissertation or research paper, you will search for literature related to your research problem and questions .
Make a list of keywords
Start by creating a list of keywords related to your research question. Include each of the key concepts or variables you’re interested in, and list any synonyms and related terms. You can add to this list as you discover new keywords in the process of your literature search.
- Social media, Facebook, Instagram, Twitter, Snapchat, TikTok
- Body image, self-perception, self-esteem, mental health
- Generation Z, teenagers, adolescents, youth
Search for relevant sources
Use your keywords to begin searching for sources. Some useful databases to search for journals and articles include:
- Your university’s library catalogue
- Google Scholar
- Project Muse (humanities and social sciences)
- Medline (life sciences and biomedicine)
- EconLit (economics)
- Inspec (physics, engineering and computer science)
You can also use boolean operators to help narrow down your search.
Make sure to read the abstract to find out whether an article is relevant to your question. When you find a useful book or article, you can check the bibliography to find other relevant sources.
You likely won’t be able to read absolutely everything that has been written on your topic, so it will be necessary to evaluate which sources are most relevant to your research question.
For each publication, ask yourself:
- What question or problem is the author addressing?
- What are the key concepts and how are they defined?
- What are the key theories, models, and methods?
- Does the research use established frameworks or take an innovative approach?
- What are the results and conclusions of the study?
- How does the publication relate to other literature in the field? Does it confirm, add to, or challenge established knowledge?
- What are the strengths and weaknesses of the research?
Make sure the sources you use are credible , and make sure you read any landmark studies and major theories in your field of research.
You can use our template to summarize and evaluate sources you’re thinking about using. Click on either button below to download.
Take notes and cite your sources
As you read, you should also begin the writing process. Take notes that you can later incorporate into the text of your literature review.
It is important to keep track of your sources with citations to avoid plagiarism . It can be helpful to make an annotated bibliography , where you compile full citation information and write a paragraph of summary and analysis for each source. This helps you remember what you read and saves time later in the process.
Prevent plagiarism. Run a free check.
To begin organizing your literature review’s argument and structure, be sure you understand the connections and relationships between the sources you’ve read. Based on your reading and notes, you can look for:
- Trends and patterns (in theory, method or results): do certain approaches become more or less popular over time?
- Themes: what questions or concepts recur across the literature?
- Debates, conflicts and contradictions: where do sources disagree?
- Pivotal publications: are there any influential theories or studies that changed the direction of the field?
- Gaps: what is missing from the literature? Are there weaknesses that need to be addressed?
This step will help you work out the structure of your literature review and (if applicable) show how your own research will contribute to existing knowledge.
- Most research has focused on young women.
- There is an increasing interest in the visual aspects of social media.
- But there is still a lack of robust research on highly visual platforms like Instagram and Snapchat—this is a gap that you could address in your own research.
There are various approaches to organizing the body of a literature review. Depending on the length of your literature review, you can combine several of these strategies (for example, your overall structure might be thematic, but each theme is discussed chronologically).
Chronological
The simplest approach is to trace the development of the topic over time. However, if you choose this strategy, be careful to avoid simply listing and summarizing sources in order.
Try to analyze patterns, turning points and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred.
If you have found some recurring central themes, you can organize your literature review into subsections that address different aspects of the topic.
For example, if you are reviewing literature about inequalities in migrant health outcomes, key themes might include healthcare policy, language barriers, cultural attitudes, legal status, and economic access.
Methodological
If you draw your sources from different disciplines or fields that use a variety of research methods , you might want to compare the results and conclusions that emerge from different approaches. For example:
- Look at what results have emerged in qualitative versus quantitative research
- Discuss how the topic has been approached by empirical versus theoretical scholarship
- Divide the literature into sociological, historical, and cultural sources
Theoretical
A literature review is often the foundation for a theoretical framework . You can use it to discuss various theories, models, and definitions of key concepts.
You might argue for the relevance of a specific theoretical approach, or combine various theoretical concepts to create a framework for your research.
Like any other academic text , your literature review should have an introduction , a main body, and a conclusion . What you include in each depends on the objective of your literature review.
The introduction should clearly establish the focus and purpose of the literature review.
Depending on the length of your literature review, you might want to divide the body into subsections. You can use a subheading for each theme, time period, or methodological approach.
As you write, you can follow these tips:
- Summarize and synthesize: give an overview of the main points of each source and combine them into a coherent whole
- Analyze and interpret: don’t just paraphrase other researchers — add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
- Critically evaluate: mention the strengths and weaknesses of your sources
- Write in well-structured paragraphs: use transition words and topic sentences to draw connections, comparisons and contrasts
In the conclusion, you should summarize the key findings you have taken from the literature and emphasize their significance.
When you’ve finished writing and revising your literature review, don’t forget to proofread thoroughly before submitting. Not a language expert? Check out Scribbr’s professional proofreading services !
This article has been adapted into lecture slides that you can use to teach your students about writing a literature review.
Scribbr slides are free to use, customize, and distribute for educational purposes.
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If you want to know more about the research process , methodology , research bias , or statistics , make sure to check out some of our other articles with explanations and examples.
- Sampling methods
- Simple random sampling
- Stratified sampling
- Cluster sampling
- Likert scales
- Reproducibility
Statistics
- Null hypothesis
- Statistical power
- Probability distribution
- Effect size
- Poisson distribution
Research bias
- Optimism bias
- Cognitive bias
- Implicit bias
- Hawthorne effect
- Anchoring bias
- Explicit bias
A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .
It is often written as part of a thesis, dissertation , or research paper , in order to situate your work in relation to existing knowledge.
There are several reasons to conduct a literature review at the beginning of a research project:
- To familiarize yourself with the current state of knowledge on your topic
- To ensure that you’re not just repeating what others have already done
- To identify gaps in knowledge and unresolved problems that your research can address
- To develop your theoretical framework and methodology
- To provide an overview of the key findings and debates on the topic
Writing the literature review shows your reader how your work relates to existing research and what new insights it will contribute.
The literature review usually comes near the beginning of your thesis or dissertation . After the introduction , it grounds your research in a scholarly field and leads directly to your theoretical framework or methodology .
A literature review is a survey of credible sources on a topic, often used in dissertations , theses, and research papers . Literature reviews give an overview of knowledge on a subject, helping you identify relevant theories and methods, as well as gaps in existing research. Literature reviews are set up similarly to other academic texts , with an introduction , a main body, and a conclusion .
An annotated bibliography is a list of source references that has a short description (called an annotation ) for each of the sources. It is often assigned as part of the research process for a paper .
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What is a literature review?
A literature review is an integrated analysis -- not just a summary-- of scholarly writings and other relevant evidence related directly to your research question. That is, it represents a synthesis of the evidence that provides background information on your topic and shows a association between the evidence and your research question.
A literature review may be a stand alone work or the introduction to a larger research paper, depending on the assignment. Rely heavily on the guidelines your instructor has given you.
Why is it important?
A literature review is important because it:
- Explains the background of research on a topic.
- Demonstrates why a topic is significant to a subject area.
- Discovers relationships between research studies/ideas.
- Identifies major themes, concepts, and researchers on a topic.
- Identifies critical gaps and points of disagreement.
- Discusses further research questions that logically come out of the previous studies.
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1. Choose a topic. Define your research question.
Your literature review should be guided by your central research question. The literature represents background and research developments related to a specific research question, interpreted and analyzed by you in a synthesized way.
- Make sure your research question is not too broad or too narrow. Is it manageable?
- Begin writing down terms that are related to your question. These will be useful for searches later.
- If you have the opportunity, discuss your topic with your professor and your class mates.
2. Decide on the scope of your review
How many studies do you need to look at? How comprehensive should it be? How many years should it cover?
- This may depend on your assignment. How many sources does the assignment require?
3. Select the databases you will use to conduct your searches.
Make a list of the databases you will search.
Where to find databases:
- use the tabs on this guide
- Find other databases in the Nursing Information Resources web page
- More on the Medical Library web page
- ... and more on the Yale University Library web page
4. Conduct your searches to find the evidence. Keep track of your searches.
- Use the key words in your question, as well as synonyms for those words, as terms in your search. Use the database tutorials for help.
- Save the searches in the databases. This saves time when you want to redo, or modify, the searches. It is also helpful to use as a guide is the searches are not finding any useful results.
- Review the abstracts of research studies carefully. This will save you time.
- Use the bibliographies and references of research studies you find to locate others.
- Check with your professor, or a subject expert in the field, if you are missing any key works in the field.
- Ask your librarian for help at any time.
- Use a citation manager, such as EndNote as the repository for your citations. See the EndNote tutorials for help.
Review the literature
Some questions to help you analyze the research:
- What was the research question of the study you are reviewing? What were the authors trying to discover?
- Was the research funded by a source that could influence the findings?
- What were the research methodologies? Analyze its literature review, the samples and variables used, the results, and the conclusions.
- Does the research seem to be complete? Could it have been conducted more soundly? What further questions does it raise?
- If there are conflicting studies, why do you think that is?
- How are the authors viewed in the field? Has this study been cited? If so, how has it been analyzed?
Tips:
- Review the abstracts carefully.
- Keep careful notes so that you may track your thought processes during the research process.
- Create a matrix of the studies for easy analysis, and synthesis, across all of the studies.
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A literature review is a document or section of a document that collects key sources on a topic and discusses those sources in conversation with each other (also called synthesis ). The lit review is an important genre in many disciplines, not just literature (i.e., the study of works of literature such as novels and plays). When we say “literature review” or refer to “the literature,” we are talking about the research ( scholarship ) in a given field. You will often see the terms “the research,” “the scholarship,” and “the literature” used mostly interchangeably.
Where, when, and why would I write a lit review?
There are a number of different situations where you might write a literature review, each with slightly different expectations; different disciplines, too, have field-specific expectations for what a literature review is and does. For instance, in the humanities, authors might include more overt argumentation and interpretation of source material in their literature reviews, whereas in the sciences, authors are more likely to report study designs and results in their literature reviews; these differences reflect these disciplines’ purposes and conventions in scholarship. You should always look at examples from your own discipline and talk to professors or mentors in your field to be sure you understand your discipline’s conventions, for literature reviews as well as for any other genre.
A literature review can be a part of a research paper or scholarly article, usually falling after the introduction and before the research methods sections. In these cases, the lit review just needs to cover scholarship that is important to the issue you are writing about; sometimes it will also cover key sources that informed your research methodology.
Lit reviews can also be standalone pieces, either as assignments in a class or as publications. In a class, a lit review may be assigned to help students familiarize themselves with a topic and with scholarship in their field, get an idea of the other researchers working on the topic they’re interested in, find gaps in existing research in order to propose new projects, and/or develop a theoretical framework and methodology for later research. As a publication, a lit review usually is meant to help make other scholars’ lives easier by collecting and summarizing, synthesizing, and analyzing existing research on a topic. This can be especially helpful for students or scholars getting into a new research area, or for directing an entire community of scholars toward questions that have not yet been answered.
What are the parts of a lit review?
Most lit reviews use a basic introduction-body-conclusion structure; if your lit review is part of a larger paper, the introduction and conclusion pieces may be just a few sentences while you focus most of your attention on the body. If your lit review is a standalone piece, the introduction and conclusion take up more space and give you a place to discuss your goals, research methods, and conclusions separately from where you discuss the literature itself.
Introduction:
- An introductory paragraph that explains what your working topic and thesis is
- A forecast of key topics or texts that will appear in the review
- Potentially, a description of how you found sources and how you analyzed them for inclusion and discussion in the review (more often found in published, standalone literature reviews than in lit review sections in an article or research paper)
- Summarize and synthesize: Give an overview of the main points of each source and combine them into a coherent whole
- Analyze and interpret: Don’t just paraphrase other researchers – add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
- Critically Evaluate: Mention the strengths and weaknesses of your sources
- Write in well-structured paragraphs: Use transition words and topic sentence to draw connections, comparisons, and contrasts.
Conclusion:
- Summarize the key findings you have taken from the literature and emphasize their significance
- Connect it back to your primary research question
How should I organize my lit review?
Lit reviews can take many different organizational patterns depending on what you are trying to accomplish with the review. Here are some examples:
- Chronological : The simplest approach is to trace the development of the topic over time, which helps familiarize the audience with the topic (for instance if you are introducing something that is not commonly known in your field). If you choose this strategy, be careful to avoid simply listing and summarizing sources in order. Try to analyze the patterns, turning points, and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred (as mentioned previously, this may not be appropriate in your discipline — check with a teacher or mentor if you’re unsure).
- Thematic : If you have found some recurring central themes that you will continue working with throughout your piece, you can organize your literature review into subsections that address different aspects of the topic. For example, if you are reviewing literature about women and religion, key themes can include the role of women in churches and the religious attitude towards women.
- Qualitative versus quantitative research
- Empirical versus theoretical scholarship
- Divide the research by sociological, historical, or cultural sources
- Theoretical : In many humanities articles, the literature review is the foundation for the theoretical framework. You can use it to discuss various theories, models, and definitions of key concepts. You can argue for the relevance of a specific theoretical approach or combine various theorical concepts to create a framework for your research.
What are some strategies or tips I can use while writing my lit review?
Any lit review is only as good as the research it discusses; make sure your sources are well-chosen and your research is thorough. Don’t be afraid to do more research if you discover a new thread as you’re writing. More info on the research process is available in our "Conducting Research" resources .
As you’re doing your research, create an annotated bibliography ( see our page on the this type of document ). Much of the information used in an annotated bibliography can be used also in a literature review, so you’ll be not only partially drafting your lit review as you research, but also developing your sense of the larger conversation going on among scholars, professionals, and any other stakeholders in your topic.
Usually you will need to synthesize research rather than just summarizing it. This means drawing connections between sources to create a picture of the scholarly conversation on a topic over time. Many student writers struggle to synthesize because they feel they don’t have anything to add to the scholars they are citing; here are some strategies to help you:
- It often helps to remember that the point of these kinds of syntheses is to show your readers how you understand your research, to help them read the rest of your paper.
- Writing teachers often say synthesis is like hosting a dinner party: imagine all your sources are together in a room, discussing your topic. What are they saying to each other?
- Look at the in-text citations in each paragraph. Are you citing just one source for each paragraph? This usually indicates summary only. When you have multiple sources cited in a paragraph, you are more likely to be synthesizing them (not always, but often
- Read more about synthesis here.
The most interesting literature reviews are often written as arguments (again, as mentioned at the beginning of the page, this is discipline-specific and doesn’t work for all situations). Often, the literature review is where you can establish your research as filling a particular gap or as relevant in a particular way. You have some chance to do this in your introduction in an article, but the literature review section gives a more extended opportunity to establish the conversation in the way you would like your readers to see it. You can choose the intellectual lineage you would like to be part of and whose definitions matter most to your thinking (mostly humanities-specific, but this goes for sciences as well). In addressing these points, you argue for your place in the conversation, which tends to make the lit review more compelling than a simple reporting of other sources.
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- Literature Review: The What, Why and How-to Guide
- Introduction
Literature Review: The What, Why and How-to Guide — Introduction
- Getting Started
- How to Pick a Topic
- Strategies to Find Sources
- Evaluating Sources & Lit. Reviews
- Tips for Writing Literature Reviews
- Writing Literature Review: Useful Sites
- Citation Resources
- Other Academic Writings
What are Literature Reviews?
So, what is a literature review? "A literature review is an account of what has been published on a topic by accredited scholars and researchers. In writing the literature review, your purpose is to convey to your reader what knowledge and ideas have been established on a topic, and what their strengths and weaknesses are. As a piece of writing, the literature review must be defined by a guiding concept (e.g., your research objective, the problem or issue you are discussing, or your argumentative thesis). It is not just a descriptive list of the material available, or a set of summaries." Taylor, D. The literature review: A few tips on conducting it . University of Toronto Health Sciences Writing Centre.
Goals of Literature Reviews
What are the goals of creating a Literature Review? A literature could be written to accomplish different aims:
- To develop a theory or evaluate an existing theory
- To summarize the historical or existing state of a research topic
- Identify a problem in a field of research
Baumeister, R. F., & Leary, M. R. (1997). Writing narrative literature reviews . Review of General Psychology , 1 (3), 311-320.
What kinds of sources require a Literature Review?
- A research paper assigned in a course
- A thesis or dissertation
- A grant proposal
- An article intended for publication in a journal
All these instances require you to collect what has been written about your research topic so that you can demonstrate how your own research sheds new light on the topic.
Types of Literature Reviews
What kinds of literature reviews are written?
Narrative review: The purpose of this type of review is to describe the current state of the research on a specific topic/research and to offer a critical analysis of the literature reviewed. Studies are grouped by research/theoretical categories, and themes and trends, strengths and weakness, and gaps are identified. The review ends with a conclusion section which summarizes the findings regarding the state of the research of the specific study, the gaps identify and if applicable, explains how the author's research will address gaps identify in the review and expand the knowledge on the topic reviewed.
- Example : Predictors and Outcomes of U.S. Quality Maternity Leave: A Review and Conceptual Framework: 10.1177/08948453211037398
Systematic review : "The authors of a systematic review use a specific procedure to search the research literature, select the studies to include in their review, and critically evaluate the studies they find." (p. 139). Nelson, L. K. (2013). Research in Communication Sciences and Disorders . Plural Publishing.
- Example : The effect of leave policies on increasing fertility: a systematic review: 10.1057/s41599-022-01270-w
Meta-analysis : "Meta-analysis is a method of reviewing research findings in a quantitative fashion by transforming the data from individual studies into what is called an effect size and then pooling and analyzing this information. The basic goal in meta-analysis is to explain why different outcomes have occurred in different studies." (p. 197). Roberts, M. C., & Ilardi, S. S. (2003). Handbook of Research Methods in Clinical Psychology . Blackwell Publishing.
- Example : Employment Instability and Fertility in Europe: A Meta-Analysis: 10.1215/00703370-9164737
Meta-synthesis : "Qualitative meta-synthesis is a type of qualitative study that uses as data the findings from other qualitative studies linked by the same or related topic." (p.312). Zimmer, L. (2006). Qualitative meta-synthesis: A question of dialoguing with texts . Journal of Advanced Nursing , 53 (3), 311-318.
- Example : Women’s perspectives on career successes and barriers: A qualitative meta-synthesis: 10.1177/05390184221113735
Literature Reviews in the Health Sciences
- UConn Health subject guide on systematic reviews Explanation of the different review types used in health sciences literature as well as tools to help you find the right review type
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- CAREER FEATURE
- 04 December 2020
- Correction 09 December 2020
How to write a superb literature review
Andy Tay is a freelance writer based in Singapore.
You can also search for this author in PubMed Google Scholar
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Literature reviews are important resources for scientists. They provide historical context for a field while offering opinions on its future trajectory. Creating them can provide inspiration for one’s own research, as well as some practice in writing. But few scientists are trained in how to write a review — or in what constitutes an excellent one. Even picking the appropriate software to use can be an involved decision (see ‘Tools and techniques’). So Nature asked editors and working scientists with well-cited reviews for their tips.
WENTING ZHAO: Be focused and avoid jargon
Assistant professor of chemical and biomedical engineering, Nanyang Technological University, Singapore.
When I was a research student, review writing improved my understanding of the history of my field. I also learnt about unmet challenges in the field that triggered ideas.
For example, while writing my first review 1 as a PhD student, I was frustrated by how poorly we understood how cells actively sense, interact with and adapt to nanoparticles used in drug delivery. This experience motivated me to study how the surface properties of nanoparticles can be modified to enhance biological sensing. When I transitioned to my postdoctoral research, this question led me to discover the role of cell-membrane curvature, which led to publications and my current research focus. I wouldn’t have started in this area without writing that review.
![how to do academic literature review](https://media.nature.com/w400/magazine-assets/d41586-020-03422-x/d41586-020-03422-x_17947370.jpg)
Collection: Careers toolkit
A common problem for students writing their first reviews is being overly ambitious. When I wrote mine, I imagined producing a comprehensive summary of every single type of nanomaterial used in biological applications. It ended up becoming a colossal piece of work, with too many papers discussed and without a clear way to categorize them. We published the work in the end, but decided to limit the discussion strictly to nanoparticles for biological sensing, rather than covering how different nanomaterials are used in biology.
My advice to students is to accept that a review is unlike a textbook: it should offer a more focused discussion, and it’s OK to skip some topics so that you do not distract your readers. Students should also consider editorial deadlines, especially for invited reviews: make sure that the review’s scope is not so extensive that it delays the writing.
A good review should also avoid jargon and explain the basic concepts for someone who is new to the field. Although I trained as an engineer, I’m interested in biology, and my research is about developing nanomaterials to manipulate proteins at the cell membrane and how this can affect ageing and cancer. As an ‘outsider’, the reviews that I find most useful for these biological topics are those that speak to me in accessible scientific language.
![how to do academic literature review A man in glasses looking at the camera.](https://media.nature.com/lw767/magazine-assets/d41586-020-03422-x/d41586-020-03422-x_18645262.jpg)
Bozhi Tian likes to get a variety of perspectives into a review. Credit: Aleksander Prominski
BOZHI TIAN: Have a process and develop your style
Associate professor of chemistry, University of Chicago, Illinois.
In my lab, we start by asking: what is the purpose of this review? My reasons for writing one can include the chance to contribute insights to the scientific community and identify opportunities for my research. I also see review writing as a way to train early-career researchers in soft skills such as project management and leadership. This is especially true for lead authors, because they will learn to work with their co-authors to integrate the various sections into a piece with smooth transitions and no overlaps.
After we have identified the need and purpose of a review article, I will form a team from the researchers in my lab. I try to include students with different areas of expertise, because it is useful to get a variety of perspectives. For example, in the review ‘An atlas of nano-enabled neural interfaces’ 2 , we had authors with backgrounds in biophysics, neuroengineering, neurobiology and materials sciences focusing on different sections of the review.
After this, I will discuss an outline with my team. We go through multiple iterations to make sure that we have scanned the literature sufficiently and do not repeat discussions that have appeared in other reviews. It is also important that the outline is not decided by me alone: students often have fresh ideas that they can bring to the table. Once this is done, we proceed with the writing.
I often remind my students to imagine themselves as ‘artists of science’ and encourage them to develop how they write and present information. Adding more words isn’t always the best way: for example, I enjoy using tables to summarize research progress and suggest future research trajectories. I’ve also considered including short videos in our review papers to highlight key aspects of the work. I think this can increase readership and accessibility because these videos can be easily shared on social-media platforms.
ANKITA ANIRBAN: Timeliness and figures make a huge difference
Editor, Nature Reviews Physics .
One of my roles as a journal editor is to evaluate proposals for reviews. The best proposals are timely and clearly explain why readers should pay attention to the proposed topic.
It is not enough for a review to be a summary of the latest growth in the literature: the most interesting reviews instead provide a discussion about disagreements in the field.
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Careers Collection: Publishing
Scientists often centre the story of their primary research papers around their figures — but when it comes to reviews, figures often take a secondary role. In my opinion, review figures are more important than most people think. One of my favourite review-style articles 3 presents a plot bringing together data from multiple research papers (many of which directly contradict each other). This is then used to identify broad trends and suggest underlying mechanisms that could explain all of the different conclusions.
An important role of a review article is to introduce researchers to a field. For this, schematic figures can be useful to illustrate the science being discussed, in much the same way as the first slide of a talk should. That is why, at Nature Reviews, we have in-house illustrators to assist authors. However, simplicity is key, and even without support from professional illustrators, researchers can still make use of many free drawing tools to enhance the value of their review figures.
![how to do academic literature review A woman wearing a lab coat smiles at the camera.](https://media.nature.com/lw767/magazine-assets/d41586-020-03422-x/d41586-020-03422-x_18645264.jpg)
Yoojin Choi recommends that researchers be open to critiques when writing reviews. Credit: Yoojin Choi
YOOJIN CHOI: Stay updated and be open to suggestions
Research assistant professor, Korea Advanced Institute of Science and Technology, Daejeon.
I started writing the review ‘Biosynthesis of inorganic nanomaterials using microbial cells and bacteriophages’ 4 as a PhD student in 2018. It took me one year to write the first draft because I was working on the review alongside my PhD research and mostly on my own, with support from my adviser. It took a further year to complete the processes of peer review, revision and publication. During this time, many new papers and even competing reviews were published. To provide the most up-to-date and original review, I had to stay abreast of the literature. In my case, I made use of Google Scholar, which I set to send me daily updates of relevant literature based on key words.
Through my review-writing process, I also learnt to be more open to critiques to enhance the value and increase the readership of my work. Initially, my review was focused only on using microbial cells such as bacteria to produce nanomaterials, which was the subject of my PhD research. Bacteria such as these are known as biofactories: that is, organisms that produce biological material which can be modified to produce useful materials, such as magnetic nanoparticles for drug-delivery purposes.
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Synchronized editing: the future of collaborative writing
However, when the first peer-review report came back, all three reviewers suggested expanding the review to cover another type of biofactory: bacteriophages. These are essentially viruses that infect bacteria, and they can also produce nanomaterials.
The feedback eventually led me to include a discussion of the differences between the various biofactories (bacteriophages, bacteria, fungi and microalgae) and their advantages and disadvantages. This turned out to be a great addition because it made the review more comprehensive.
Writing the review also led me to an idea about using nanomaterial-modified microorganisms to produce chemicals, which I’m still researching now.
PAULA MARTIN-GONZALEZ: Make good use of technology
PhD student, University of Cambridge, UK.
Just before the coronavirus lockdown, my PhD adviser and I decided to write a literature review discussing the integration of medical imaging with genomics to improve ovarian cancer management.
As I was researching the review, I noticed a trend in which some papers were consistently being cited by many other papers in the field. It was clear to me that those papers must be important, but as a new member of the field of integrated cancer biology, it was difficult to immediately find and read all of these ‘seminal papers’.
That was when I decided to code a small application to make my literature research more efficient. Using my code, users can enter a query, such as ‘ovarian cancer, computer tomography, radiomics’, and the application searches for all relevant literature archived in databases such as PubMed that feature these key words.
The code then identifies the relevant papers and creates a citation graph of all the references cited in the results of the search. The software highlights papers that have many citation relationships with other papers in the search, and could therefore be called seminal papers.
My code has substantially improved how I organize papers and has informed me of key publications and discoveries in my research field: something that would have taken more time and experience in the field otherwise. After I shared my code on GitHub, I received feedback that it can be daunting for researchers who are not used to coding. Consequently, I am hoping to build a more user-friendly interface in a form of a web page, akin to PubMed or Google Scholar, where users can simply input their queries to generate citation graphs.
Tools and techniques
Most reference managers on the market offer similar capabilities when it comes to providing a Microsoft Word plug-in and producing different citation styles. But depending on your working preferences, some might be more suitable than others.
Reference managers
Attribute | EndNote | Mendeley | Zotero | Paperpile |
---|---|---|---|---|
Cost | A one-time cost of around US$340 but comes with discounts for academics; around $150 for students | Free version available | Free version available | Low and comes with academic discounts |
Level of user support | Extensive user tutorials available; dedicated help desk | Extensive user tutorials available; global network of 5,000 volunteers to advise users | Forum discussions to troubleshoot | Forum discussions to troubleshoot |
Desktop version available for offline use? | Available | Available | Available | Unavailable |
Document storage on cloud | Up to 2 GB (free version) | Up to 2 GB (free version) | Up to 300 MB (free version) | Storage linked to Google Drive |
Compatible with Google Docs? | No | No | Yes | Yes |
Supports collaborative working? | No group working | References can be shared or edited by a maximum of three other users (or more in the paid-for version) | No limit on the number of users | No limit on the number of users |
Here is a comparison of the more popular collaborative writing tools, but there are other options, including Fidus Writer, Manuscript.io, Authorea and Stencila.
Collaborative writing tools
Attribute | Manubot | Overleaf | Google Docs |
---|---|---|---|
Cost | Free, open source | $15–30 per month, comes with academic discounts | Free, comes with a Google account |
Writing language | Type and write in Markdown* | Type and format in LaTex* | Standard word processor |
Can be used with a mobile device? | No | No | Yes |
References | Bibliographies are built using DOIs, circumventing reference managers | Citation styles can be imported from reference managers | Possible but requires additional referencing tools in a plug-in, such as Paperpile |
*Markdown and LaTex are code-based formatting languages favoured by physicists, mathematicians and computer scientists who code on a regular basis, and less popular in other disciplines such as biology and chemistry.
doi: https://doi.org/10.1038/d41586-020-03422-x
Interviews have been edited for length and clarity.
Updates & Corrections
Correction 09 December 2020 : An earlier version of the tables in this article included some incorrect details about the programs Zotero, Endnote and Manubot. These have now been corrected.
Hsing, I.-M., Xu, Y. & Zhao, W. Electroanalysis 19 , 755–768 (2007).
Article Google Scholar
Ledesma, H. A. et al. Nature Nanotechnol. 14 , 645–657 (2019).
Article PubMed Google Scholar
Brahlek, M., Koirala, N., Bansal, N. & Oh, S. Solid State Commun. 215–216 , 54–62 (2015).
Choi, Y. & Lee, S. Y. Nature Rev. Chem . https://doi.org/10.1038/s41570-020-00221-w (2020).
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Literature review
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How to write a literature review in 6 steps
How do you write a good literature review? This step-by-step guide on how to write an excellent literature review covers all aspects of planning and writing literature reviews for academic papers and theses.
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How to write a systematic literature review [9 steps]
How do you write a systematic literature review? What types of systematic literature reviews exist and where do you use them? Learn everything you need to know about a systematic literature review in this guide
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What is a literature review? [with examples]
Not sure what a literature review is? This guide covers the definition, purpose, and format of a literature review.
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Introduction
Literature reviews take time. here is some general information to know before you start. .
- VIDEO -- This video is a great overview of the entire process. (2020; North Carolina State University Libraries) --The transcript is included --This is for everyone; ignore the mention of "graduate students" --9.5 minutes, and every second is important
- OVERVIEW -- Read this page from Purdue's OWL. It's not long, and gives some tips to fill in what you just learned from the video.
- NOT A RESEARCH ARTICLE -- A literature review follows a different style, format, and structure from a research article.
Reports on the work of others. | Reports on original research. | |
To examine and evaluate previous literature. | To test a hypothesis and/or make an argument. May include a short literature review to introduce the subject. |
Steps to Completing a Literature Review
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How to Write a Literature Review: Six Steps to Get You from Start to Finish
Writing-a-literature-review-six-steps-to-get-you-from-start-to-finish.
Tanya Golash-Boza, Associate Professor of Sociology, University of California
February 03, 2022
Writing a literature review is often the most daunting part of writing an article, book, thesis, or dissertation. “The literature” seems (and often is) massive. I have found it helpful to be as systematic as possible when completing this gargantuan task.
Sonja Foss and William Walters* describe an efficient and effective way of writing a literature review. Their system provides an excellent guide for getting through the massive amounts of literature for any purpose: in a dissertation, an M.A. thesis, or preparing a research article for publication in any field of study. Below is a summary of the steps they outline as well as a step-by-step method for writing a literature review.
How to Write a Literature Review
Step One: Decide on your areas of research:
Before you begin to search for articles or books, decide beforehand what areas you are going to research. Make sure that you only get articles and books in those areas, even if you come across fascinating books in other areas. A literature review I am currently working on, for example, explores barriers to higher education for undocumented students.
Step Two: Search for the literature:
Conduct a comprehensive bibliographic search of books and articles in your area. Read the abstracts online and download and/or print those articles that pertain to your area of research. Find books in the library that are relevant and check them out. Set a specific time frame for how long you will search. It should not take more than two or three dedicated sessions.
Step Three: Find relevant excerpts in your books and articles:
Skim the contents of each book and article and look specifically for these five things:
1. Claims, conclusions, and findings about the constructs you are investigating
2. Definitions of terms
3. Calls for follow-up studies relevant to your project
4. Gaps you notice in the literature
5. Disagreement about the constructs you are investigating
When you find any of these five things, type the relevant excerpt directly into a Word document. Don’t summarize, as summarizing takes longer than simply typing the excerpt. Make sure to note the name of the author and the page number following each excerpt. Do this for each article and book that you have in your stack of literature. When you are done, print out your excerpts.
Step Four: Code the literature:
Get out a pair of scissors and cut each excerpt out. Now, sort the pieces of paper into similar topics. Figure out what the main themes are. Place each excerpt into a themed pile. Make sure each note goes into a pile. If there are excerpts that you can’t figure out where they belong, separate those and go over them again at the end to see if you need new categories. When you finish, place each stack of notes into an envelope labeled with the name of the theme.
Step Five: Create Your Conceptual Schema:
Type, in large font, the name of each of your coded themes. Print this out, and cut the titles into individual slips of paper. Take the slips of paper to a table or large workspace and figure out the best way to organize them. Are there ideas that go together or that are in dialogue with each other? Are there ideas that contradict each other? Move around the slips of paper until you come up with a way of organizing the codes that makes sense. Write the conceptual schema down before you forget or someone cleans up your slips of paper.
Step Six: Begin to Write Your Literature Review:
Choose any section of your conceptual schema to begin with. You can begin anywhere, because you already know the order. Find the envelope with the excerpts in them and lay them on the table in front of you. Figure out a mini-conceptual schema based on that theme by grouping together those excerpts that say the same thing. Use that mini-conceptual schema to write up your literature review based on the excerpts that you have in front of you. Don’t forget to include the citations as you write, so as not to lose track of who said what. Repeat this for each section of your literature review.
Once you complete these six steps, you will have a complete draft of your literature review. The great thing about this process is that it breaks down into manageable steps something that seems enormous: writing a literature review.
I think that Foss and Walter’s system for writing the literature review is ideal for a dissertation, because a Ph.D. candidate has already read widely in his or her field through graduate seminars and comprehensive exams.
It may be more challenging for M.A. students, unless you are already familiar with the literature. It is always hard to figure out how much you need to read for deep meaning, and how much you just need to know what others have said. That balance will depend on how much you already know.
For people writing literature reviews for articles or books, this system also could work, especially when you are writing in a field with which you are already familiar. The mere fact of having a system can make the literature review seem much less daunting, so I recommend this system for anyone who feels overwhelmed by the prospect of writing a literature review.
*Destination Dissertation: A Traveler's Guide to a Done Dissertation
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Literature review
A general guide on how to conduct and write a literature review.
Please check course or programme information and materials provided by teaching staff, including your project supervisor, for subject-specific guidance.
What is a literature review?
A literature review is a piece of academic writing demonstrating knowledge and understanding of the academic literature on a specific topic placed in context. A literature review also includes a critical evaluation of the material; this is why it is called a literature review rather than a literature report. It is a process of reviewing the literature, as well as a form of writing.
To illustrate the difference between reporting and reviewing, think about television or film review articles. These articles include content such as a brief synopsis or the key points of the film or programme plus the critic’s own evaluation. Similarly the two main objectives of a literature review are firstly the content covering existing research, theories and evidence, and secondly your own critical evaluation and discussion of this content.
Usually a literature review forms a section or part of a dissertation, research project or long essay. However, it can also be set and assessed as a standalone piece of work.
What is the purpose of a literature review?
…your task is to build an argument, not a library. Rudestam, K.E. and Newton, R.R. (1992) Surviving your dissertation: A comprehensive guide to content and process. California: Sage, p49.
In a larger piece of written work, such as a dissertation or project, a literature review is usually one of the first tasks carried out after deciding on a topic. Reading combined with critical analysis can help to refine a topic and frame research questions. Conducting a literature review establishes your familiarity with and understanding of current research in a particular field before carrying out a new investigation. After doing a literature review, you should know what research has already been done and be able to identify what is unknown within your topic.
When doing and writing a literature review, it is good practice to:
- summarise and analyse previous research and theories;
- identify areas of controversy and contested claims;
- highlight any gaps that may exist in research to date.
Conducting a literature review
Focusing on different aspects of your literature review can be useful to help plan, develop, refine and write it. You can use and adapt the prompt questions in our worksheet below at different points in the process of researching and writing your review. These are suggestions to get you thinking and writing.
Developing and refining your literature review (pdf)
Developing and refining your literature review (Word)
Developing and refining your literature review (Word rtf)
Writing a literature review has a lot in common with other assignment tasks. There is advice on our other pages about thinking critically, reading strategies and academic writing. Our literature review top tips suggest some specific things you can do to help you submit a successful review.
Literature review top tips (pdf)
Literature review top tips (Word rtf)
Our reading page includes strategies and advice on using books and articles and a notes record sheet grid you can use.
Reading at university
The Academic writing page suggests ways to organise and structure information from a range of sources and how you can develop your argument as you read and write.
Academic writing
The Critical thinking page has advice on how to be a more critical researcher and a form you can use to help you think and break down the stages of developing your argument.
Critical thinking
As with other forms of academic writing, your literature review needs to demonstrate good academic practice by following the Code of Student Conduct and acknowledging the work of others through citing and referencing your sources.
Good academic practice
As with any writing task, you will need to review, edit and rewrite sections of your literature review. The Editing and proofreading page includes tips on how to do this and strategies for standing back and thinking about your structure and checking the flow of your argument.
Editing and proofreading
Guidance on literature searching from the University Library
The Academic Support Librarians have developed LibSmart I and II, Learn courses to help you develop and enhance your digital research skills and capabilities; from getting started with the Library to managing data for your dissertation.
Searching using the library’s DiscoverEd tool: DiscoverEd
Finding resources in your subject: Subject guides
The Academic Support Librarians also provide one-to-one appointments to help you develop your research strategies.
1 to 1 support for literature searching and systematic reviews
Advice to help you optimise use of Google Scholar, Google Books and Google for your research and study: Using Google
Managing and curating your references
A referencing management tool can help you to collect and organise and your source material to produce a bibliography or reference list.
Referencing and reference management
Information Services provide access to Cite them right online which is a guide to the main referencing systems and tells you how to reference just about any source (EASE log-in may be required).
Cite them right
Published study guides
There are a number of scholarship skills books and guides available which can help with writing a literature review. Our Resource List of study skills guides includes sections on Referencing, Dissertation and project writing and Literature reviews.
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This article was published on 2024-02-26
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Literature reviews
Writing a literature review.
The following guide has been created for you by the Student Learning Advisory Service . For more detailed guidance and to speak to one of our advisers, please book an appointment or join one of our workshops . Alternatively, have a look at our SkillBuilder skills videos.
Preparing a literature review involves:
- Searching for reliable, accurate and up-to-date material on a topic or subject
- Reading and summarising the key points from this literature
- Synthesising these key ideas, theories and concepts into a summary of what is known
- Discussing and evaluating these ideas, theories and concepts
- Identifying particular areas of debate or controversy
- Preparing the ground for the application of these ideas to new research
Finding and choosing material
Ensure you are clear on what you are looking for. ask yourself:.
- What is the specific question, topic or focus of my assignment?
- What kind of material do I need (e.g. theory, policy, empirical data)?
- What type of literature is available (e.g. journals, books, government documents)?
What kind of literature is particularly authoritative in this academic discipline (e.g. psychology, sociology, pharmacy)?
![](http://farmaciacoslada.online/777/templates/cheerup1/res/banner1.gif)
How much do you need?
This will depend on the length of the dissertation, the nature of the subject, and the level of study (undergraduate, Masters, PhD). As a very rough rule of thumb – you may choose 8-10 significant pieces (books and/or articles) for an 8,000 word dissertation, up to 20 major pieces of work for 12-15,000 words, and so on. Bear in mind that if your dissertation is based mainly around an interaction with existing scholarship you will need a longer literature review than if it is there as a prelude to new empirical research. Use your judgement or ask your supervisor for guidance.
Where to find suitable material
Your literature review should include a balance between substantial academic books, journal articles and other scholarly publications. All these sources should be as up-to-date as possible, with the exception of ‘classic texts’ such as major works written by leading scholars setting out formative ideas and theories central to your subject. There are several ways to locate suitable material:
Module bibliography: for undergraduate dissertations, look first at the bibliography provided with the module documentation. Choose one or two likely looking books or articles and then scan through the bibliographies provided by these authors. Skim read some of this material looking for clues: can you use these leads to identify key theories and authors or track down other appropriate material?
Library catalogue search engine: enter a few key words to capture a range of items, but avoid over-generalisations; if you type in something as broad as ‘social theory’ you are likely to get several thousand results. Be more specific: for example, ‘Heidegger, existentialism’. Ideally, you should narrow the field to obtain just a few dozen results. Skim through these quickly to identity texts which are most likely to contribute to your study.
Library bookshelves: browse the library shelves in the relevant subject area and examine the books that catch your eye. Check the contents and index pages, or skim through the introductions (or abstracts, in the case of journal articles) to see if they contain relevant material, and replace them if not. Don’t be afraid to ask one of the subject librarians for further help. Your supervisor may also be able to point you in the direction of some of the important literature , but remember this is your literature search, not theirs.
Online: for recent journal articles you will almost certainly need to use one of the online search engines. These can be found on the ‘Indexing Services’ button on the Templeman Library website. Kent students based at Medway still need to use the Templeman pages to access online journals, although you can get to these pages through the Drill Hall Library catalogue. Take a look as well at the Subject Guides on both the Templeman and DHL websites.
Check that you have made the right selection by asking:
- Has my search been wide enough to ensure that I have identified all the relevant material, but narrow enough to exclude irrelevant material?
- Is there a good enough sample of literature for the level (PhD, Masters, undergraduate) of my dissertation or thesis?
- Have I considered as many alternative points of view as possible?
- Will the reader find my literature review relevant and useful?
Assessing the literature
Read the material you have chosen carefully, considering the following:
- The key point discussed by the author: is this clearly defined
- What evidence has the author produced to support this central idea?
- How convincing are the reasons given for the author’s point of view?
- Could the evidence be interpreted in other ways?
- What is the author's research method (e.g. qualitative, quantitative, experimental, etc.)?
- What is the author's theoretical framework (e.g. psychological, developmental, feminist)?
- What is the relationship assumed by the author between theory and practice?
- Has the author critically evaluated the other literature in the field?
- Does the author include literature opposing their point of view?
- Is the research data based on a reliable method and accurate information?
- Can you ‘deconstruct’ the argument – identify the gaps or jumps in the logic?
- What are the strengths and limitations of this study?
- What does this book or article contribute to the field or topic?
- What does this book or article contribute to my own topic or thesis?
As you note down the key content of each book or journal article (together with the reference details of each source) record your responses to these questions. You will then be able to summarise each piece of material from two perspectives:
Content: a brief description of the content of the book or article. Remember, an author will often make just one key point; so, what is the point they are making, and how does it relate to your own research project or assignment?
Critical analysis: an assessment of the relative strengths and weaknesses of the evidence used, and the arguments presented. Has anything conveniently been left out or skated over? Is there a counter-argument, and has the author dealt with this adequately? Can the evidence presented be interpreted another way? Does the author demonstrate any obvious bias which could affect their reliability? Overall, based on the above analysis of the author’s work, how do you evaluate its contribution to the scholarly understanding and knowledge surrounding the topic?
Structuring the literature review
In a PhD thesis, the literature review typically comprises one chapter (perhaps 8-10,000 words), for a Masters dissertation it may be around 2-3,000 words, and for an undergraduate dissertation it may be no more than 2,000 words. In each case the word count can vary depending on a range of factors and it is always best, if in doubt, to ask your supervisor.
The overall structure of the section or chapter should be like any other: it should have a beginning, middle and end. You will need to guide the reader through the literature review, outlining the strategy you have adopted for selecting the books or articles, presenting the topic theme for the review, then using most of the word limit to analyse the chosen books or articles thoroughly before pulling everything together briefly in the conclusion.
Some people prefer a less linear approach. Instead of simply working through a list of 8-20 items on your book review list, you might want to try a thematic approach, grouping key ideas, facts, concepts or approaches together and then bouncing the ideas off each other. This is a slightly more creative (and interesting) way of producing the review, but a little more risky as it is harder to establish coherence and logical sequencing.
Whichever approach you adopt, make sure everything flows smoothly – that one idea or book leads neatly to the next. Take your reader effortlessly through a sequence of thought that is clear, accurate, precise and interesting.
Writing up your literature review
As with essays generally, only attempt to write up the literature review when you have completed all the reading and note-taking, and carefully planned its content and structure. Find an appropriate way of introducing the review, then guide the reader through the material clearly and directly, bearing in mind the following:
- Be selective in the number of points you draw out from each piece of literature; remember that one of your objectives is to demonstrate that you can use your judgement to identify what is central and what is secondary.
- Summarise and synthesise – use your own words to sum up what you think is important or controversial about the book or article.
- Never claim more than the evidence will support. Too many dissertations and theses are let down by sweeping generalisations. Be tentative and careful in the way you interpret the evidence.
- Keep your own voice – you are entitled to your own point of view provided it is based on evidence and clear argument.
- At the same time, aim to project an objective and tentative tone by using the 3rd person, (for example, ‘this tends to suggest’, ‘it could be argued’ and so on).
- Even with a literature review you should avoid using too many, or overlong, quotes. Summarise material in your own words as much as possible. Save the quotes for ‘punch-lines’ to drive a particular point home.
- Revise, revise, revise: refine and edit the draft as much as you can. Check for fluency, structure, evidence, criticality and referencing, and don’t forget the basics of good grammar, punctuation and spelling.
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Literature review
This guide is for students who are new to writing literature reviews, for example, as part of an assignment or for an initial investigation for designing your own research topic.
Note: If you are required to write a literature review for a research proposal, you might also want to browse the library guide to systematic and systemic-like reviews.
What is a literature review?
The purpose of a literature review is to locate peer-reviewed sources that inform you of key ideas in your field of study. By ‘literature’ we mean books, academic journal articles and other sources. The information you gather from reading these sources can then be used to identify potential gaps in knowledge or to investigate new issues that may not have been noticed before. A literature review is often used to develop research questions for future research.
As a general rule, your literature review should:
- Explain why your research topic is important.
- Provide a critical analysis of the ideas in the literature rather than just describe the findings.
- Organise ideas into themes rather than by source.
- Identify similarities and differences in opinions, evidence and the findings of sources.
- Identify areas of controversy, or limitations of research methods
- Include citations of sources and a reference list or bibliography (according to your required referencing style).
The number of sources referred to in a literature review may vary. An undergraduate literature review may be a short assessment so you may only need to review a small number of sources. Alternatively, you may be given a set of sources to review, or you may be asked to find your own sources. At an honours or postgraduate level, a literature review will include a larger number of sources. Generally, the higher the word count, the greater the number of sources you are expected to include. As with any assignment or research project, it is important to discuss and determine your topic, word count and referencing style with your lecturer or supervisor before you begin.
Literature review or annotated bibliography?
Don’t confuse a literature review with an annotated bibliography! Although they are two different ways of reviewing the literature, these are two distinct genres of academic writing.
A literature review has a beginning, middle and end (like an introduction, body paragraphs and a conclusion). It requires you to analyse and evaluate key literature on a given topic - to identify, compare and contrast common themes explored in the literature.
In contrast, an annotated bibliography is a list of short descriptive summaries of readings on a particular topic or area of research. It does not compare and contrast sources. The sources are ordered in a list format according to the source reference.
Reading and researching
To produce a good literature review, you must show that you have researched and read widely. A wide-ranging review will often include books, journal articles, reports, government documents and credible web resources. The quality of your review will be judged by the quality of your sources. Therefore, it is important to manage your time by selectively reviewing the abstract, table of contents and headings before you start reading to see if the source is relevant to your topic.
Ask yourself the following questions to help you start your literature review:
- What is the purpose of the review?
- Which themes will I focus on?
- What questions do I need to ask about the literature?
- What types of sources are suitable for the questions?
- How much time do I have to research, read, analyse and synthesise the literature?
- Which referencing style am I required to use (e.g. Harvard, APA etc)?
Selecting and evaluating sources
Use a set of questions, such as those below, to help choose appropriate sources for evaluation and analysis.
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What categories will you use to select sources? Why are these categories/themes relevant to the question? Do you have enough time to include all the categories? | Is there a geographic limit to your studies? What is the relevance of the geographical location to the question? Is there a time limit to your studies? What is the relevance of the historical context to the question? | Which literature did you reject and why? What have you included? | To show you have critically analysed the literature you will need to : How relevant is this article to your topic? How authoritative and credible is this source? What are the major patterns and trends presented? How has the author structured the arguments, and why? |
- Find out how to plan your library search and download the library search planner to develop your search plan.
- Access the library’s finding information tutorials to help you start your literature search.
- Review this guide to critical thinking, reading and note taking.
Analysing and note taking
Keep critical notes as you read.
It can be useful to keep a daily journal of your personal responses and thinking processes on what you are reading for your literature review. Doing this on a regular basis will also improve your disciplinary vocabulary and help you to write about the literature in your own words.
In your journal:
- Analyse the findings from each source will help you to build a whole picture of the topic you are exploring.
- Consider using a table, matrix or mind map to identify findings, common themes, disagreements and key ideas that are common throughout the papers.
Use this notetaking matrix for a literature review to help you analyse and synthesise texts you are researching for you literature review.
Try using a brainstorming and mind mapping tool like Xmind to assist with organising your research.
Writing your review
The structure of a review is similar to an essay in that it contains an introduction, a body and a conclusion. However, a literature review will also include - a description of your search methods, paragraphs organised into themes and a concluding summary of key themes and how the review contributes to understanding the topic you are investigating. Writing your literature review can take some time so expect to write a few different drafts before you complete your final copy.
Introduction
Your introduction should help your reader with the context and purpose of your literature review. Tell your reader:
- The aim of your review.
- Why you are writing a review and why the topic is important.
- What aspects will be discussed.
- The scope of your review, e.g. what points you will include and what methods/limitations you used to find readings.
- An overview of the themes you will discuss.
Body paragraphs
The body paragraphs of your review will contain your review of the literature relevant to your research topic. To write your body paragraphs, you will need to synthesise your reviewed readings so that there is a clear link between the various sources. You will need to critically analyse each source and show how they contribute to the themes you are researching.
The body might include paragraphs that focus on:
- background and methodologies
- other studies on the topic
- key questions being asked
- conclusions that are being drawn.
In your conclusion, give a summary of:
- The main agreements and disagreements in the literature.
- Any gaps or areas for further research.
- Your perspective on the topic.
Further language tips
Review this sample literature review for further tips.
Download these student guides:
- Sample literature review and language tips
- Note taking matrix for a literature review
Book an appointment with a language and learning adviser; or First Nations students can book with the First Nations academic support links
- Book an appointment
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Literature review.
- Getting Started
- Chemistry journals and databases
- Find Dissertations and Theses
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- Find Technical Reports
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- Managing Your Academic Identity
- Helpful Tools
Reviewing the Literature: Why do it?
- Personal: To familiarize yourself with a new area of research, to get an overview of a topic, so you don't want to miss something important, etc.
- Required writing for a journal article, thesis or dissertation, grant application, etc.
Literature reviews vary; there are many ways to write a literature review based on discipline, material type, and other factors.
Background:
- Literature Reviews - UNC Writing Center
- Literature Reviews: An Overview for Graduate Students - What is a literature review? What purpose does it serve in research? What should you expect when writing one? - NCSU Video
Where to get help (there are lots of websites, blogs , articles, and books on this topic) :
- The Center for writing and Communicating Ideas (CWCI)
- (these are non-STEM examples: dissertation guidance , journal guidelines )
- How to prepare a scientific doctoral dissertation based on research articles (2012)
- Writing a graduate thesis or dissertation (2016)
- The good paper : a handbook for writing papers in higher education (2015)
- Proposals that work : a guide for planning dissertations and grant proposals (2014)
- Theses and dissertations : a guide to planning, research, and writing (2008)
- Talk to your professors, advisors, mentors, peers, etc. for advice
READ related material and pay attention to how others write their literature reviews:
- Dissertations
- Journal articles
- Grant proposals
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Literature Review: The What, Why and How-to Guide: Literature Reviews?
- Literature Reviews?
- Strategies to Finding Sources
- Keeping up with Research!
- Evaluating Sources & Literature Reviews
- Organizing for Writing
- Writing Literature Review
- Other Academic Writings
What is a Literature Review?
So, what is a literature review .
"A literature review is an account of what has been published on a topic by accredited scholars and researchers. In writing the literature review, your purpose is to convey to your reader what knowledge and ideas have been established on a topic, and what their strengths and weaknesses are. As a piece of writing, the literature review must be defined by a guiding concept (e.g., your research objective, the problem or issue you are discussing, or your argumentative thesis). It is not just a descriptive list of the material available or a set of summaries." - Quote from Taylor, D. (n.d)."The Literature Review: A Few Tips on Conducting it".
- Citation: "The Literature Review: A Few Tips on Conducting it"
What kinds of literature reviews are written?
Each field has a particular way to do reviews for academic research literature. In the social sciences and humanities the most common are:
- Narrative Reviews: The purpose of this type of review is to describe the current state of the research on a specific research topic and to offer a critical analysis of the literature reviewed. Studies are grouped by research/theoretical categories, and themes and trends, strengths and weaknesses, and gaps are identified. The review ends with a conclusion section that summarizes the findings regarding the state of the research of the specific study, the gaps identify and if applicable, explains how the author's research will address gaps identify in the review and expand the knowledge on the topic reviewed.
- Book review essays/ Historiographical review essays : A type of literature review typical in History and related fields, e.g., Latin American studies. For example, the Latin American Research Review explains that the purpose of this type of review is to “(1) to familiarize readers with the subject, approach, arguments, and conclusions found in a group of books whose common focus is a historical period; a country or region within Latin America; or a practice, development, or issue of interest to specialists and others; (2) to locate these books within current scholarship, critical methodologies, and approaches; and (3) to probe the relation of these new books to previous work on the subject, especially canonical texts. Unlike individual book reviews, the cluster reviews found in LARR seek to address the state of the field or discipline and not solely the works at issue.” - LARR
What are the Goals of Creating a Literature Review?
- To develop a theory or evaluate an existing theory
- To summarize the historical or existing state of a research topic
- Identify a problem in a field of research
- Baumeister, R.F. & Leary, M.R. (1997). "Writing narrative literature reviews," Review of General Psychology , 1(3), 311-320.
When do you need to write a Literature Review?
- When writing a prospectus or a thesis/dissertation
- When writing a research paper
- When writing a grant proposal
In all these cases you need to dedicate a chapter in these works to showcase what has been written about your research topic and to point out how your own research will shed new light into a body of scholarship.
Where I can find examples of Literature Reviews?
Note: In the humanities, even if they don't use the term "literature review", they may have a dedicated chapter that reviewed the "critical bibliography" or they incorporated that review in the introduction or first chapter of the dissertation, book, or article.
- UCSB electronic theses and dissertations In partnership with the Graduate Division, the UC Santa Barbara Library is making available theses and dissertations produced by UCSB students. Currently included in ADRL are theses and dissertations that were originally filed electronically, starting in 2011. In future phases of ADRL, all theses and dissertations created by UCSB students may be digitized and made available.
Where to Find Standalone Literature Reviews
Literature reviews are also written as standalone articles as a way to survey a particular research topic in-depth. This type of literature review looks at a topic from a historical perspective to see how the understanding of the topic has changed over time.
- Find e-Journals for Standalone Literature Reviews The best way to get familiar with and to learn how to write literature reviews is by reading them. You can use our Journal Search option to find journals that specialize in publishing literature reviews from major disciplines like anthropology, sociology, etc. Usually these titles are called, "Annual Review of [discipline name] OR [Discipline name] Review. This option works best if you know the title of the publication you are looking for. Below are some examples of these journals! more... less... Journal Search can be found by hovering over the link for Research on the library website.
Social Sciences
- Annual Review of Anthropology
- Annual Review of Political Science
- Annual Review of Sociology
- Ethnic Studies Review
Hard science and health sciences:
- Annual Review of Biomedical Data Science
- Annual Review of Materials Science
- Systematic Review From journal site: "The journal Systematic Reviews encompasses all aspects of the design, conduct, and reporting of systematic reviews" in the health sciences.
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How to write a literature review introduction (+ examples)
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The introduction to a literature review serves as your reader’s guide through your academic work and thought process. Explore the significance of literature review introductions in review papers, academic papers, essays, theses, and dissertations. We delve into the purpose and necessity of these introductions, explore the essential components of literature review introductions, and provide step-by-step guidance on how to craft your own, along with examples.
Why you need an introduction for a literature review
In academic writing , the introduction for a literature review is an indispensable component. Effective academic writing requires proper paragraph structuring to guide your reader through your argumentation. This includes providing an introduction to your literature review.
It is imperative to remember that you should never start sharing your findings abruptly. Even if there isn’t a dedicated introduction section .
When you need an introduction for a literature review
There are three main scenarios in which you need an introduction for a literature review:
What to include in a literature review introduction
It is crucial to customize the content and depth of your literature review introduction according to the specific format of your academic work.
In practical terms, this implies, for instance, that the introduction in an academic literature review paper, especially one derived from a systematic literature review , is quite comprehensive. Particularly compared to the rather brief one or two introductory sentences that are often found at the beginning of a literature review section in a standard academic paper. The introduction to the literature review chapter in a thesis or dissertation again adheres to different standards.
Academic literature review paper
The introduction of an academic literature review paper, which does not rely on empirical data, often necessitates a more extensive introduction than the brief literature review introductions typically found in empirical papers. It should encompass:
Regular literature review section in an academic article or essay
In a standard 8000-word journal article, the literature review section typically spans between 750 and 1250 words. The first few sentences or the first paragraph within this section often serve as an introduction. It should encompass:
In some cases, you might include:
Introduction to a literature review chapter in thesis or dissertation
Some students choose to incorporate a brief introductory section at the beginning of each chapter, including the literature review chapter. Alternatively, others opt to seamlessly integrate the introduction into the initial sentences of the literature review itself. Both approaches are acceptable, provided that you incorporate the following elements:
Examples of literature review introductions
Example 1: an effective introduction for an academic literature review paper.
To begin, let’s delve into the introduction of an academic literature review paper. We will examine the paper “How does culture influence innovation? A systematic literature review”, which was published in 2018 in the journal Management Decision.
Example 2: An effective introduction to a literature review section in an academic paper
The second example represents a typical academic paper, encompassing not only a literature review section but also empirical data, a case study, and other elements. We will closely examine the introduction to the literature review section in the paper “The environmentalism of the subalterns: a case study of environmental activism in Eastern Kurdistan/Rojhelat”, which was published in 2021 in the journal Local Environment.
Thus, the author successfully introduces the literature review, from which point onward it dives into the main concept (‘subalternity’) of the research, and reviews the literature on socio-economic justice and environmental degradation.
Examples 3-5: Effective introductions to literature review chapters
Numerous universities offer online repositories where you can access theses and dissertations from previous years, serving as valuable sources of reference. Many of these repositories, however, may require you to log in through your university account. Nevertheless, a few open-access repositories are accessible to anyone, such as the one by the University of Manchester . It’s important to note though that copyright restrictions apply to these resources, just as they would with published papers.
Master’s thesis literature review introduction
Phd thesis literature review chapter introduction, phd thesis literature review introduction.
The last example is the doctoral thesis Metacognitive strategies and beliefs: Child correlates and early experiences Chan, K. Y. M. (Author). 31 Dec 2020 . The author clearly conducted a systematic literature review, commencing the review section with a discussion of the methodology and approach employed in locating and analyzing the selected records.
Steps to write your own literature review introduction
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Approaching literature review for academic purposes: The Literature Review Checklist
Debora f.b. leite.
I Departamento de Ginecologia e Obstetricia, Faculdade de Ciencias Medicas, Universidade Estadual de Campinas, Campinas, SP, BR
II Universidade Federal de Pernambuco, Pernambuco, PE, BR
III Hospital das Clinicas, Universidade Federal de Pernambuco, Pernambuco, PE, BR
Maria Auxiliadora Soares Padilha
Jose g. cecatti.
A sophisticated literature review (LR) can result in a robust dissertation/thesis by scrutinizing the main problem examined by the academic study; anticipating research hypotheses, methods and results; and maintaining the interest of the audience in how the dissertation/thesis will provide solutions for the current gaps in a particular field. Unfortunately, little guidance is available on elaborating LRs, and writing an LR chapter is not a linear process. An LR translates students’ abilities in information literacy, the language domain, and critical writing. Students in postgraduate programs should be systematically trained in these skills. Therefore, this paper discusses the purposes of LRs in dissertations and theses. Second, the paper considers five steps for developing a review: defining the main topic, searching the literature, analyzing the results, writing the review and reflecting on the writing. Ultimately, this study proposes a twelve-item LR checklist. By clearly stating the desired achievements, this checklist allows Masters and Ph.D. students to continuously assess their own progress in elaborating an LR. Institutions aiming to strengthen students’ necessary skills in critical academic writing should also use this tool.
INTRODUCTION
Writing the literature review (LR) is often viewed as a difficult task that can be a point of writer’s block and procrastination ( 1 ) in postgraduate life. Disagreements on the definitions or classifications of LRs ( 2 ) may confuse students about their purpose and scope, as well as how to perform an LR. Interestingly, at many universities, the LR is still an important element in any academic work, despite the more recent trend of producing scientific articles rather than classical theses.
The LR is not an isolated section of the thesis/dissertation or a copy of the background section of a research proposal. It identifies the state-of-the-art knowledge in a particular field, clarifies information that is already known, elucidates implications of the problem being analyzed, links theory and practice ( 3 - 5 ), highlights gaps in the current literature, and places the dissertation/thesis within the research agenda of that field. Additionally, by writing the LR, postgraduate students will comprehend the structure of the subject and elaborate on their cognitive connections ( 3 ) while analyzing and synthesizing data with increasing maturity.
At the same time, the LR transforms the student and hints at the contents of other chapters for the reader. First, the LR explains the research question; second, it supports the hypothesis, objectives, and methods of the research project; and finally, it facilitates a description of the student’s interpretation of the results and his/her conclusions. For scholars, the LR is an introductory chapter ( 6 ). If it is well written, it demonstrates the student’s understanding of and maturity in a particular topic. A sound and sophisticated LR can indicate a robust dissertation/thesis.
A consensus on the best method to elaborate a dissertation/thesis has not been achieved. The LR can be a distinct chapter or included in different sections; it can be part of the introduction chapter, part of each research topic, or part of each published paper ( 7 ). However, scholars view the LR as an integral part of the main body of an academic work because it is intrinsically connected to other sections ( Figure 1 ) and is frequently present. The structure of the LR depends on the conventions of a particular discipline, the rules of the department, and the student’s and supervisor’s areas of expertise, needs and interests.
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Interestingly, many postgraduate students choose to submit their LR to peer-reviewed journals. As LRs are critical evaluations of current knowledge, they are indeed publishable material, even in the form of narrative or systematic reviews. However, systematic reviews have specific patterns 1 ( 8 ) that may not entirely fit with the questions posed in the dissertation/thesis. Additionally, the scope of a systematic review may be too narrow, and the strict criteria for study inclusion may omit important information from the dissertation/thesis. Therefore, this essay discusses the definition of an LR is and methods to develop an LR in the context of an academic dissertation/thesis. Finally, we suggest a checklist to evaluate an LR.
WHAT IS A LITERATURE REVIEW IN A THESIS?
Conducting research and writing a dissertation/thesis translates rational thinking and enthusiasm ( 9 ). While a strong body of literature that instructs students on research methodology, data analysis and writing scientific papers exists, little guidance on performing LRs is available. The LR is a unique opportunity to assess and contrast various arguments and theories, not just summarize them. The research results should not be discussed within the LR, but the postgraduate student tends to write a comprehensive LR while reflecting on his or her own findings ( 10 ).
Many people believe that writing an LR is a lonely and linear process. Supervisors or the institutions assume that the Ph.D. student has mastered the relevant techniques and vocabulary associated with his/her subject and conducts a self-reflection about previously published findings. Indeed, while elaborating the LR, the student should aggregate diverse skills, which mainly rely on his/her own commitment to mastering them. Thus, less supervision should be required ( 11 ). However, the parameters described above might not currently be the case for many students ( 11 , 12 ), and the lack of formal and systematic training on writing LRs is an important concern ( 11 ).
An institutional environment devoted to active learning will provide students the opportunity to continuously reflect on LRs, which will form a dialogue between the postgraduate student and the current literature in a particular field ( 13 ). Postgraduate students will be interpreting studies by other researchers, and, according to Hart (1998) ( 3 ), the outcomes of the LR in a dissertation/thesis include the following:
- To identify what research has been performed and what topics require further investigation in a particular field of knowledge;
- To determine the context of the problem;
- To recognize the main methodologies and techniques that have been used in the past;
- To place the current research project within the historical, methodological and theoretical context of a particular field;
- To identify significant aspects of the topic;
- To elucidate the implications of the topic;
- To offer an alternative perspective;
- To discern how the studied subject is structured;
- To improve the student’s subject vocabulary in a particular field; and
- To characterize the links between theory and practice.
A sound LR translates the postgraduate student’s expertise in academic and scientific writing: it expresses his/her level of comfort with synthesizing ideas ( 11 ). The LR reveals how well the postgraduate student has proceeded in three domains: an effective literature search, the language domain, and critical writing.
Effective literature search
All students should be trained in gathering appropriate data for specific purposes, and information literacy skills are a cornerstone. These skills are defined as “an individual’s ability to know when they need information, to identify information that can help them address the issue or problem at hand, and to locate, evaluate, and use that information effectively” ( 14 ). Librarian support is of vital importance in coaching the appropriate use of Boolean logic (AND, OR, NOT) and other tools for highly efficient literature searches (e.g., quotation marks and truncation), as is the appropriate management of electronic databases.
Language domain
Academic writing must be concise and precise: unnecessary words distract the reader from the essential content ( 15 ). In this context, reading about issues distant from the research topic ( 16 ) may increase students’ general vocabulary and familiarity with grammar. Ultimately, reading diverse materials facilitates and encourages the writing process itself.
Critical writing
Critical judgment includes critical reading, thinking and writing. It supposes a student’s analytical reflection about what he/she has read. The student should delineate the basic elements of the topic, characterize the most relevant claims, identify relationships, and finally contrast those relationships ( 17 ). Each scientific document highlights the perspective of the author, and students will become more confident in judging the supporting evidence and underlying premises of a study and constructing their own counterargument as they read more articles. A paucity of integration or contradictory perspectives indicates lower levels of cognitive complexity ( 12 ).
Thus, while elaborating an LR, the postgraduate student should achieve the highest category of Bloom’s cognitive skills: evaluation ( 12 ). The writer should not only summarize data and understand each topic but also be able to make judgments based on objective criteria, compare resources and findings, identify discrepancies due to methodology, and construct his/her own argument ( 12 ). As a result, the student will be sufficiently confident to show his/her own voice .
Writing a consistent LR is an intense and complex activity that reveals the training and long-lasting academic skills of a writer. It is not a lonely or linear process. However, students are unlikely to be prepared to write an LR if they have not mastered the aforementioned domains ( 10 ). An institutional environment that supports student learning is crucial.
Different institutions employ distinct methods to promote students’ learning processes. First, many universities propose modules to develop behind the scenes activities that enhance self-reflection about general skills (e.g., the skills we have mastered and the skills we need to develop further), behaviors that should be incorporated (e.g., self-criticism about one’s own thoughts), and each student’s role in the advancement of his/her field. Lectures or workshops about LRs themselves are useful because they describe the purposes of the LR and how it fits into the whole picture of a student’s work. These activities may explain what type of discussion an LR must involve, the importance of defining the correct scope, the reasons to include a particular resource, and the main role of critical reading.
Some pedagogic services that promote a continuous improvement in study and academic skills are equally important. Examples include workshops about time management, the accomplishment of personal objectives, active learning, and foreign languages for nonnative speakers. Additionally, opportunities to converse with other students promotes an awareness of others’ experiences and difficulties. Ultimately, the supervisor’s role in providing feedback and setting deadlines is crucial in developing students’ abilities and in strengthening students’ writing quality ( 12 ).
HOW SHOULD A LITERATURE REVIEW BE DEVELOPED?
A consensus on the appropriate method for elaborating an LR is not available, but four main steps are generally accepted: defining the main topic, searching the literature, analyzing the results, and writing ( 6 ). We suggest a fifth step: reflecting on the information that has been written in previous publications ( Figure 2 ).
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First step: Defining the main topic
Planning an LR is directly linked to the research main question of the thesis and occurs in parallel to students’ training in the three domains discussed above. The planning stage helps organize ideas, delimit the scope of the LR ( 11 ), and avoid the wasting of time in the process. Planning includes the following steps:
- Reflecting on the scope of the LR: postgraduate students will have assumptions about what material must be addressed and what information is not essential to an LR ( 13 , 18 ). Cooper’s Taxonomy of Literature Reviews 2 systematizes the writing process through six characteristics and nonmutually exclusive categories. The focus refers to the reviewer’s most important points of interest, while the goals concern what students want to achieve with the LR. The perspective assumes answers to the student’s own view of the LR and how he/she presents a particular issue. The coverage defines how comprehensive the student is in presenting the literature, and the organization determines the sequence of arguments. The audience is defined as the group for whom the LR is written.
- Designating sections and subsections: Headings and subheadings should be specific, explanatory and have a coherent sequence throughout the text ( 4 ). They simulate an inverted pyramid, with an increasing level of reflection and depth of argument.
- Identifying keywords: The relevant keywords for each LR section should be listed to guide the literature search. This list should mirror what Hart (1998) ( 3 ) advocates as subject vocabulary . The keywords will also be useful when the student is writing the LR since they guide the reader through the text.
- Delineating the time interval and language of documents to be retrieved in the second step. The most recently published documents should be considered, but relevant texts published before a predefined cutoff year can be included if they are classic documents in that field. Extra care should be employed when translating documents.
Second step: Searching the literature
The ability to gather adequate information from the literature must be addressed in postgraduate programs. Librarian support is important, particularly for accessing difficult texts. This step comprises the following components:
- Searching the literature itself: This process consists of defining which databases (electronic or dissertation/thesis repositories), official documents, and books will be searched and then actively conducting the search. Information literacy skills have a central role in this stage. While searching electronic databases, controlled vocabulary (e.g., Medical Subject Headings, or MeSH, for the PubMed database) or specific standardized syntax rules may need to be applied.
In addition, two other approaches are suggested. First, a review of the reference list of each document might be useful for identifying relevant publications to be included and important opinions to be assessed. This step is also relevant for referencing the original studies and leading authors in that field. Moreover, students can directly contact the experts on a particular topic to consult with them regarding their experience or use them as a source of additional unpublished documents.
Before submitting a dissertation/thesis, the electronic search strategy should be repeated. This process will ensure that the most recently published papers will be considered in the LR.
- Selecting documents for inclusion: Generally, the most recent literature will be included in the form of published peer-reviewed papers. Assess books and unpublished material, such as conference abstracts, academic texts and government reports, are also important to assess since the gray literature also offers valuable information. However, since these materials are not peer-reviewed, we recommend that they are carefully added to the LR.
This task is an important exercise in time management. First, students should read the title and abstract to understand whether that document suits their purposes, addresses the research question, and helps develop the topic of interest. Then, they should scan the full text, determine how it is structured, group it with similar documents, and verify whether other arguments might be considered ( 5 ).
Third step: Analyzing the results
Critical reading and thinking skills are important in this step. This step consists of the following components:
- Reading documents: The student may read various texts in depth according to LR sections and subsections ( defining the main topic ), which is not a passive activity ( 1 ). Some questions should be asked to practice critical analysis skills, as listed below. Is the research question evident and articulated with previous knowledge? What are the authors’ research goals and theoretical orientations, and how do they interact? Are the authors’ claims related to other scholars’ research? Do the authors consider different perspectives? Was the research project designed and conducted properly? Are the results and discussion plausible, and are they consistent with the research objectives and methodology? What are the strengths and limitations of this work? How do the authors support their findings? How does this work contribute to the current research topic? ( 1 , 19 )
- Taking notes: Students who systematically take notes on each document are more readily able to establish similarities or differences with other documents and to highlight personal observations. This approach reinforces the student’s ideas about the next step and helps develop his/her own academic voice ( 1 , 13 ). Voice recognition software ( 16 ), mind maps ( 5 ), flowcharts, tables, spreadsheets, personal comments on the referenced texts, and note-taking apps are all available tools for managing these observations, and the student him/herself should use the tool that best improves his/her learning. Additionally, when a student is considering submitting an LR to a peer-reviewed journal, notes should be taken on the activities performed in all five steps to ensure that they are able to be replicated.
Fourth step: Writing
The recognition of when a student is able and ready to write after a sufficient period of reading and thinking is likely a difficult task. Some students can produce a review in a single long work session. However, as discussed above, writing is not a linear process, and students do not need to write LRs according to a specific sequence of sections. Writing an LR is a time-consuming task, and some scholars believe that a period of at least six months is sufficient ( 6 ). An LR, and academic writing in general, expresses the writer’s proper thoughts, conclusions about others’ work ( 6 , 10 , 13 , 16 ), and decisions about methods to progress in the chosen field of knowledge. Thus, each student is expected to present a different learning and writing trajectory.
In this step, writing methods should be considered; then, editing, citing and correct referencing should complete this stage, at least temporarily. Freewriting techniques may be a good starting point for brainstorming ideas and improving the understanding of the information that has been read ( 1 ). Students should consider the following parameters when creating an agenda for writing the LR: two-hour writing blocks (at minimum), with prespecified tasks that are possible to complete in one section; short (minutes) and long breaks (days or weeks) to allow sufficient time for mental rest and reflection; and short- and long-term goals to motivate the writing itself ( 20 ). With increasing experience, this scheme can vary widely, and it is not a straightforward rule. Importantly, each discipline has a different way of writing ( 1 ), and each department has its own preferred styles for citations and references.
Fifth step: Reflecting on the writing
In this step, the postgraduate student should ask him/herself the same questions as in the analyzing the results step, which can take more time than anticipated. Ambiguities, repeated ideas, and a lack of coherence may not be noted when the student is immersed in the writing task for long periods. The whole effort will likely be a work in progress, and continuous refinements in the written material will occur once the writing process has begun.
LITERATURE REVIEW CHECKLIST
In contrast to review papers, the LR of a dissertation/thesis should not be a standalone piece or work. Instead, it should present the student as a scholar and should maintain the interest of the audience in how that dissertation/thesis will provide solutions for the current gaps in a particular field.
A checklist for evaluating an LR is convenient for students’ continuous academic development and research transparency: it clearly states the desired achievements for the LR of a dissertation/thesis. Here, we present an LR checklist developed from an LR scoring rubric ( 11 ). For a critical analysis of an LR, we maintain the five categories but offer twelve criteria that are not scaled ( Figure 3 ). The criteria all have the same importance and are not mutually exclusive.
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First category: Coverage
1. justified criteria exist for the inclusion and exclusion of literature in the review.
This criterion builds on the main topic and areas covered by the LR ( 18 ). While experts may be confident in retrieving and selecting literature, postgraduate students must convince their audience about the adequacy of their search strategy and their reasons for intentionally selecting what material to cover ( 11 ). References from different fields of knowledge provide distinct perspective, but narrowing the scope of coverage may be important in areas with a large body of existing knowledge.
Second category: Synthesis
2. a critical examination of the state of the field exists.
A critical examination is an assessment of distinct aspects in the field ( 1 ) along with a constructive argument. It is not a negative critique but an expression of the student’s understanding of how other scholars have added to the topic ( 1 ), and the student should analyze and contextualize contradictory statements. A writer’s personal bias (beliefs or political involvement) have been shown to influence the structure and writing of a document; therefore, the cultural and paradigmatic background guide how the theories are revised and presented ( 13 ). However, an honest judgment is important when considering different perspectives.
3. The topic or problem is clearly placed in the context of the broader scholarly literature
The broader scholarly literature should be related to the chosen main topic for the LR ( how to develop the literature review section). The LR can cover the literature from one or more disciplines, depending on its scope, but it should always offer a new perspective. In addition, students should be careful in citing and referencing previous publications. As a rule, original studies and primary references should generally be included. Systematic and narrative reviews present summarized data, and it may be important to cite them, particularly for issues that should be understood but do not require a detailed description. Similarly, quotations highlight the exact statement from another publication. However, excessive referencing may disclose lower levels of analysis and synthesis by the student.
4. The LR is critically placed in the historical context of the field
Situating the LR in its historical context shows the level of comfort of the student in addressing a particular topic. Instead of only presenting statements and theories in a temporal approach, which occasionally follows a linear timeline, the LR should authentically characterize the student’s academic work in the state-of-art techniques in their particular field of knowledge. Thus, the LR should reinforce why the dissertation/thesis represents original work in the chosen research field.
5. Ambiguities in definitions are considered and resolved
Distinct theories on the same topic may exist in different disciplines, and one discipline may consider multiple concepts to explain one topic. These misunderstandings should be addressed and contemplated. The LR should not synthesize all theories or concepts at the same time. Although this approach might demonstrate in-depth reading on a particular topic, it can reveal a student’s inability to comprehend and synthesize his/her research problem.
6. Important variables and phenomena relevant to the topic are articulated
The LR is a unique opportunity to articulate ideas and arguments and to purpose new relationships between them ( 10 , 11 ). More importantly, a sound LR will outline to the audience how these important variables and phenomena will be addressed in the current academic work. Indeed, the LR should build a bidirectional link with the remaining sections and ground the connections between all of the sections ( Figure 1 ).
7. A synthesized new perspective on the literature has been established
The LR is a ‘creative inquiry’ ( 13 ) in which the student elaborates his/her own discourse, builds on previous knowledge in the field, and describes his/her own perspective while interpreting others’ work ( 13 , 17 ). Thus, students should articulate the current knowledge, not accept the results at face value ( 11 , 13 , 17 ), and improve their own cognitive abilities ( 12 ).
Third category: Methodology
8. the main methodologies and research techniques that have been used in the field are identified and their advantages and disadvantages are discussed.
The LR is expected to distinguish the research that has been completed from investigations that remain to be performed, address the benefits and limitations of the main methods applied to date, and consider the strategies for addressing the expected limitations described above. While placing his/her research within the methodological context of a particular topic, the LR will justify the methodology of the study and substantiate the student’s interpretations.
9. Ideas and theories in the field are related to research methodologies
The audience expects the writer to analyze and synthesize methodological approaches in the field. The findings should be explained according to the strengths and limitations of previous research methods, and students must avoid interpretations that are not supported by the analyzed literature. This criterion translates to the student’s comprehension of the applicability and types of answers provided by different research methodologies, even those using a quantitative or qualitative research approach.
Fourth category: Significance
10. the scholarly significance of the research problem is rationalized.
The LR is an introductory section of a dissertation/thesis and will present the postgraduate student as a scholar in a particular field ( 11 ). Therefore, the LR should discuss how the research problem is currently addressed in the discipline being investigated or in different disciplines, depending on the scope of the LR. The LR explains the academic paradigms in the topic of interest ( 13 ) and methods to advance the field from these starting points. However, an excess number of personal citations—whether referencing the student’s research or studies by his/her research team—may reflect a narrow literature search and a lack of comprehensive synthesis of ideas and arguments.
11. The practical significance of the research problem is rationalized
The practical significance indicates a student’s comprehensive understanding of research terminology (e.g., risk versus associated factor), methodology (e.g., efficacy versus effectiveness) and plausible interpretations in the context of the field. Notably, the academic argument about a topic may not always reflect the debate in real life terms. For example, using a quantitative approach in epidemiology, statistically significant differences between groups do not explain all of the factors involved in a particular problem ( 21 ). Therefore, excessive faith in p -values may reflect lower levels of critical evaluation of the context and implications of a research problem by the student.
Fifth category: Rhetoric
12. the lr was written with a coherent, clear structure that supported the review.
This category strictly relates to the language domain: the text should be coherent and presented in a logical sequence, regardless of which organizational ( 18 ) approach is chosen. The beginning of each section/subsection should state what themes will be addressed, paragraphs should be carefully linked to each other ( 10 ), and the first sentence of each paragraph should generally summarize the content. Additionally, the student’s statements are clear, sound, and linked to other scholars’ works, and precise and concise language that follows standardized writing conventions (e.g., in terms of active/passive voice and verb tenses) is used. Attention to grammar, such as orthography and punctuation, indicates prudence and supports a robust dissertation/thesis. Ultimately, all of these strategies provide fluency and consistency for the text.
Although the scoring rubric was initially proposed for postgraduate programs in education research, we are convinced that this checklist is a valuable tool for all academic areas. It enables the monitoring of students’ learning curves and a concentrated effort on any criteria that are not yet achieved. For institutions, the checklist is a guide to support supervisors’ feedback, improve students’ writing skills, and highlight the learning goals of each program. These criteria do not form a linear sequence, but ideally, all twelve achievements should be perceived in the LR.
CONCLUSIONS
A single correct method to classify, evaluate and guide the elaboration of an LR has not been established. In this essay, we have suggested directions for planning, structuring and critically evaluating an LR. The planning of the scope of an LR and approaches to complete it is a valuable effort, and the five steps represent a rational starting point. An institutional environment devoted to active learning will support students in continuously reflecting on LRs, which will form a dialogue between the writer and the current literature in a particular field ( 13 ).
The completion of an LR is a challenging and necessary process for understanding one’s own field of expertise. Knowledge is always transitory, but our responsibility as scholars is to provide a critical contribution to our field, allowing others to think through our work. Good researchers are grounded in sophisticated LRs, which reveal a writer’s training and long-lasting academic skills. We recommend using the LR checklist as a tool for strengthening the skills necessary for critical academic writing.
AUTHOR CONTRIBUTIONS
Leite DFB has initially conceived the idea and has written the first draft of this review. Padilha MAS and Cecatti JG have supervised data interpretation and critically reviewed the manuscript. All authors have read the draft and agreed with this submission. Authors are responsible for all aspects of this academic piece.
ACKNOWLEDGMENTS
We are grateful to all of the professors of the ‘Getting Started with Graduate Research and Generic Skills’ module at University College Cork, Cork, Ireland, for suggesting and supporting this article. Funding: DFBL has granted scholarship from Brazilian Federal Agency for Support and Evaluation of Graduate Education (CAPES) to take part of her Ph.D. studies in Ireland (process number 88881.134512/2016-01). There is no participation from sponsors on authors’ decision to write or to submit this manuscript.
No potential conflict of interest was reported.
1 The questions posed in systematic reviews usually follow the ‘PICOS’ acronym: Population, Intervention, Comparison, Outcomes, Study design.
2 In 1988, Cooper proposed a taxonomy that aims to facilitate students’ and institutions’ understanding of literature reviews. Six characteristics with specific categories are briefly described: Focus: research outcomes, research methodologies, theories, or practices and applications; Goals: integration (generalization, conflict resolution, and linguistic bridge-building), criticism, or identification of central issues; Perspective: neutral representation or espousal of a position; Coverage: exhaustive, exhaustive with selective citations, representative, central or pivotal; Organization: historical, conceptual, or methodological; and Audience: specialized scholars, general scholars, practitioners or policymakers, or the general public.
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Getting Help with Your Literature Review
For more detailed information about the topics covered here, including more strategies, examples, and practice exercises, you can complete a WebCampus module on Conducting a Literature Review , which is available through the library's Self-Guided Learning page.
To get help with conducting a literature review, contact UNR's subject librarian for your discipline. You can email your librarian directly or make an appointment with them for an in-person or Zoom consultation.
Consult the following resources for more information on conducting a literature review.
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The Guide to Literature Reviews
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- What is a Literature Review?
- The Purpose of Literature Reviews
- Guidelines for Writing a Literature Review
- How to Organize a Literature Review?
- Software for Literature Reviews
- Using Artificial Intelligence for Literature Reviews
- How to Conduct a Literature Review?
- Common Mistakes and Pitfalls in a Literature Review
- Methods for Literature Reviews
When to conduct a systematic review?
How do systematic literature reviews differ from other reviews, how to conduct a systematic literature review.
- What is a Narrative Literature Review?
- What is a Descriptive Literature Review?
- What is a Scoping Literature Review?
- What is a Realist Literature Review?
- What is a Critical Literature Review?
- Meta Analysis vs. Literature Review
- What is an Umbrella Literature Review?
- Differences Between Annotated Bibliographies and Literature Reviews
- Literature Review vs. Theoretical Framework
- How to Write a Literature Review?
- How to Structure a Literature Review?
- How to Make a Cover Page for a Literature Review?
- How to Write an Abstract for a Literature Review?
- How to Write a Literature Review Introduction?
- How to Write the Body of a Literature Review?
- How to Write a Literature Review Conclusion?
- How to Make a Literature Review Bibliography?
- How to Format a Literature Review?
- How Long Should a Literature Review Be?
- Examples of Literature Reviews
- How to Present a Literature Review?
- How to Publish a Literature Review?
What is a Systematic Literature Review?
A systematic literature review is a structured, organized and transparent process for identifying, selecting, and critically appraising relevant research studies to answer a specific research question . Systematic reviews apply predefined criteria for selecting studies, assessing their quality, and synthesizing their findings. This rigorous methodology ensures that a literature review is exhaustive and reproducible.
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At the heart of a systematic review lies a well-defined protocol that guides the entire process, from the formulation of research questions to the selection and appraisal of relevant studies. This systematic approach contrasts with other literature reviews, which may be conducted more flexibly.
The methods in a systematic literature review are designed to offer a comprehensive textual summary and synthesis of existing research, providing context and background information critical to understanding the broader research landscape. Systematic reviews are essential for informing evidence-based practices and policy decisions, as they consolidate findings from numerous studies and offer a high level of evidence.
A systematic review often follows specific guidelines such as the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) (Page et al., 2020). The guidelines ensure that reviews are conducted rigorously and reported clearly. This facilitates the replication of findings and the assessment of conclusions; while PRISMA primarily focuses on quantitative research , it has extensions like PRISMA-ScR that can apply to qualitative research . Researchers also use the Cochrane Handbook for Systematic Literature Reviews (Higgins et al., 2023) which focuses on detailed guidelines for doing systematic reviews of healthcare interventions.
Systematic reviews are often used in evidence-based research and practice, particularly in environmental science, healthcare, and social sciences. Researchers undertake these reviews to identify gaps in current evidence and suggest areas for further investigation. They are essential in developing guidelines and informing policies by providing nuanced and detailed evaluations of experiences, perceptions, and contextual factors.
Qualitative systematic reviews support grant applications by demonstrating the current state of qualitative knowledge and the need for further exploration. Organizations employ a systematic review methodology to improve practices and interventions. Public health professionals rely on qualitative systematic reviews to assess the effectiveness of interventions and shape strategies that consider the socio-cultural contexts. Regularly updating these reviews ensures that the synthesized qualitative evidence remains current, aiding in more informed and effective decision-making in various disciplines.
Systematic literature reviews differ from other types of reviews in their methodology, scope, and rigour. They follow a structured approach with clear research questions, predefined criteria, comprehensive search strategies, and systematic data extraction. Other reviews, like narrative reviews , are more flexible and less structured, often lacking predefined criteria and systematic searches.
Systematic reviews aim to cover all relevant studies on a specific question. In contrast, other reviews may focus on a narrower study scope and include studies selectively, reflecting the author's perspective. Systematic reviews also employ a systematic search strategy to cover multiple databases and grey literature sources such as government or technical reports, reducing the risk of cherry-picking studies.
Rigor is another key difference. Systematic reviews critically appraise the quality of included studies and often use statistical methods (in the case of quantitative research ) or thematic analysis to synthesize findings. Other reviews do not usually include formal quality assessments and rely more on narrative synthesis.
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Reproducibility is a hallmark of systematic reviews. They document their process in detail, allowing others to replicate the study. Other reviews often lack this detailed methodology, making replication difficult and leading to potential inconsistencies.
Transparency is crucial in systematic reviews, with published protocols, documented search strategies, and clear study selection processes. Guidelines like the PRISMA checklist (Page et. al 2020) ensure thorough reporting. Other reviews do not usually follow strict guidelines and may not fully disclose their methods and criteria.
The primary objective of systematic reviews is to provide high-quality evidence, informing clinical practice, policy-making, and further research. Other reviews aim to offer overviews or summaries of the literature, providing insights and perspectives rather than systematic evidence synthesis.
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To effectively conduct a systematic literature review, it is crucial to follow a structured set of instructions that encompass comprehensive planning, rigorous methodology, and meticulous documentation. The following steps are recommended when conducting a systematic literature review:
Define the research question : Clearly state the research question(s) you intend to answer, ensuring it is specific, open-ended, and suitable for detailed exploration. This will guide all subsequent steps. For example, "How do adolescents perceive the impact of social media on their mental health?" Break down the main question into sub-questions, such as: What are the positive and negative perceptions of social media among adolescents? How do adolescents describe their emotional responses to social media interactions? What coping strategies do adolescents use to manage social media-induced stress?
Develop a protocol : Outline the methodology and criteria for your review in a detailed protocol to ensure transparency. Include background information, rationales, and clearly stated objectives. Define inclusion and exclusion criteria based on the study population, context, data collection methods, and outcomes of interest. Identify and list the databases you will search, such as PubMed , PsycINFO , and Scopus . Develop keywords and search strings using Boolean operators. Create a data extraction form to capture relevant data from each study. Optionally, register your protocol with a platform like PROSPERO for enhanced transparency.
Conduct a comprehensive literature search : Perform a thorough search across identified databases using developed keywords and search strategy. Document the search process meticulously, including search dates, databases searched, and the number of records retrieved. This ensures a comprehensive capture of relevant studies related to your research question.
Screen and select studies : Apply the inclusion and exclusion criteria to filter studies. Start with an initial screening of titles and abstracts, followed by a full-text review of remaining studies for final inclusion. Document reasons for exclusion at each stage to ensure transparency and consistency.
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Page M J, McKenzie J E, Bossuyt P M, Boutron I, Hoffmann T C, Mulrow C D et al. The PRISMA 2020 statement: an updated guideline for reporting systematic reviews BMJ 2021; 372 :n71 doi:10.1136/bmj.n71
Higgins JPT, Thomas J, Chandler J, Cumpston M, Li T, Page MJ, Welch VA (editors). Cochrane Handbook for Systematic Reviews of Interventions version 6.4 (updated August 2023). Cochrane, 2023.
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Case reports, author contributions, conflict of interest, acknowledgments.
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Is unilateral cerebellum sufficient? Insights from new cases of cerebellar agenesis and literature review
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Dingmei Deng and Yizhi Yuan contributed equally as co-first authors.
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Dingmei Deng, Bo Tao, Yizhi Yuan, Yongsheng Ao, Lihua Qiu, Is unilateral cerebellum sufficient? Insights from new cases of cerebellar agenesis and literature review, Psychoradiology , Volume 4, 2024, kkae012, https://doi.org/10.1093/psyrad/kkae012
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The clinical manifestations of adult-acquired cerebellar diseases often surpass those of congenital cerebellar diseases, suggesting the significant role of the cerebellum in the developing brain. Moreover, emerging evidence from structural and functional magnetic resonance imaging indicates that the cerebellum is implicated not only in motor functions but also in non-motor domains such as cognition, emotion, and language. However, delineating the specific extent of cerebellar development required to prevent deficits in either motor or non-motor functions remains challenging. In this study, we present two new cases of unilateral cerebellar agenesis. One individual leads a nearly normal life, while the other exhibits mild cognitive impairment, mild depression, and severe autism, but maintains normal motor function. Van der Heijden et al . (2023) revealed that the brain can compensate for some, but not all, perturbations to the developing cerebellum, including motor deficits and impairments in social behaviors. Therefore, we hypothesize that comparing structural images from our patients and reviewing pertinent literature may elucidate the reasons for the varied clinical manifestations observed in patients with cerebellar agenesis.
A 22-year-old right-handed male patient underwent a magnetic resonance imaging (MRI) scan (GE 3.0 T SIGNA Pioneer) following a traffic accident. The scan revealed a complete absence of the left cerebellum, as well as the absence of the inferior cerebellar vermis and enlargement of the ipsilateral pons and cerebral peduncle (Fig. 1 ). Furthermore, diffusion tensor imaging (DTI) demonstrated a complete lack of the efferent and afferent pathways of the left cerebellum (Fig. 1 ). No abnormalities were observed in the supratentorial brain morphology on routine MRI.
![how to do academic literature review (A) An axial T2-weighted image shows hyperintensity in posterior fossa and no cerebellar tissue (black star). Axial 3D-T1-weighted image (B) and axial T1-enhanced image (C) reveal that there is no recognizable cerebellar structure, the left posterior fossa is filled by CSF and a cerebrovascular in the left cerebellar hemisphere (blue arrow). (D) A sagittal 3D-T1-weighted image shows the absence of the inferior cerebellar vermis (white triangle). Axial 3D-T1-weighted images (E, F) show ipsilateral enlargement of the pons and cerebral peduncle (thick, white arrow). (G) DTI shows complete lack of the efferent and afferent limbs of the left cerebellum.](https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/psyrad/4/10.1093_psyrad_kkae012/1/m_kkae012fig1.jpeg?Expires=1724564415&Signature=dUJORq35RzzFHOeBJ3cSTtVtok~CmOEcWWxS48VQyWkE9u8d73gW5phwzr0oH1-AQGcJwlt-5w5lAa11uKmK3QBpwhfE~mf7nBBTmM4euySPuGoEJ3i-bhZjFJ-99qpSAAuruLvelNVeTm7PmJ7JDE-j8U9KUuDsb3abNC-PikhN1QoAtq6hx8WFt3GPbq77vjQWS2X9s-cg~I7dSwtAD~Qnl~EWoC99A7YkEJqeWya0s~Xh9EOp4n9vz~BUb62u3zpzTImEv60QLjgC56~fUU0akVh07DQY-QuzjoYRSn2ymF2nUWa4Dvik0lsFzgx8AMRobLbraqwyA53lKQIc3Q__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
( A ) An axial T2-weighted image shows hyperintensity in posterior fossa and no cerebellar tissue (black star). Axial 3D-T1-weighted image ( B ) and axial T1-enhanced image ( C ) reveal that there is no recognizable cerebellar structure, the left posterior fossa is filled by CSF and a cerebrovascular in the left cerebellar hemisphere (blue arrow). ( D ) A sagittal 3D-T1-weighted image shows the absence of the inferior cerebellar vermis (white triangle). Axial 3D-T1-weighted images ( E, F ) show ipsilateral enlargement of the pons and cerebral peduncle (thick, white arrow). ( G ) DTI shows complete lack of the efferent and afferent limbs of the left cerebellum.
According to his mother, he began to walk at the age of 1 but was unstable and prone to falls, especially during the first 2 years. However, his walking gradually improved after the age of 6. In comparison to his peers, he exhibits normal reading, writing, and calculating abilities, but experiences difficulties with memory and presents with strabismus. The patient was able to cooperate during the neurological examination, and his comprehension and verbal expression were unaffected. Neuropsychological testing, including assessments of cognitive function, depression, and autism severity, was conducted on the patient using the Montreal Cognitive Assessment, Hamilton Depression Rating Scale, and Childhood Autism Rating Scale, respectively. The test results indicated moderate cognitive impairment (with a score of 17 on the Montreal Cognitive Assessment), mild depression (score of 12 on the Hamilton Depression Rating Scale), and severe autism symptoms (score of 38 on the Childhood Autism Rating Scale). There is no reported history of other illnesses in the patient, and there is no reported history of neurological disorders in his family. It is noteworthy that his mother experienced a severe intrauterine infection during her pregnancy with him.
A 57-year-old right-handed female presented to the hospital with complaints of intermittent dizziness, which she had experienced over the preceding 15 years. Laboratory tests revealed no significant abnormalities. An MRI scan (GE 1.5 T Signa HDe) showed a near-total absence of the left cerebellum, with remnants representing the anterior quadrangular lobule (Fig. 2 ). Additionally, there was isolated normal inferior vermis lobulation with small volume, contralateral enlargement of the cerebellar hemisphere, and ipsilateral enlargement of the pons and cerebral peduncle (Fig. 2 ). DTI demonstrated afferent and efferent fibers connecting the pons and remnants of the cerebellum (Fig. 2E , F). Routine MRI showed no abnormalities in supratentorial brain morphology. She is employed as a manual laborer and demonstrates proficient performance of associated daily tasks, showing no apparent functional deficits. Neurological examination showed no abnormalities. Despite recommendations for additional comprehensive neurological assessments, she declined further evaluation.
![how to do academic literature review (A) An axial T2-weighted image shows the absence of the left cerebellum with CSF filled the posterior fossa (black star). (B) An axial 3D-T1-weighted image shows the remaining cerebrovascular in the left cerebellar hemisphere (thin white arrow), similar to Fig. 1(B, C) and shows the remaining cerebellar remnant (red arrow). (C) A sagittal 3D-T1-weighted image shows the hypoplasia of the inferior cerebellar vermis (white triangle). Axial 3D-T1-weighted images (B, D) show ipsilateral enlargement of the pons and cerebral peduncle (thick, white arrow). (E, F) DTI shows fibrous connections between the pons and cerebellar remnants (white arrow).](https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/psyrad/4/10.1093_psyrad_kkae012/1/m_kkae012fig2.jpeg?Expires=1724564415&Signature=g41jPdAcQACGpTb4Rn5TN6AnuZ5FY-Gnknimb4aEQzfGO77XJM-9CX5YAO5v4u9PLRYOwV86Rdr7PycFu8390ePold1NaaJt70wht0yTO~6bhicoJwNpcq~nvFPDJdnFqwVvKW6Gnb5iiSYCLiwMibZUMTf4mAPkO2wvoL2UJSg2jgLX9bQzDuL~biee~PJB16wfI~in72IapI5lOovJCyidjU3iKg4mi7dVNFkGACCQmYqFv8nwmeGqjwi6l~pHCzpN5sfjdaaxxUUI-n-EbDbwjvVe6taJuyfGYx0Ktq2ppxq1ijX5jW955QngdCuwm0O-knPigeHEnvqjYYe3IA__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
( A ) An axial T2-weighted image shows the absence of the left cerebellum with CSF filled the posterior fossa (black star). ( B ) An axial 3D-T1-weighted image shows the remaining cerebrovascular in the left cerebellar hemisphere (thin white arrow), similar to Fig. 1 (B, C) and shows the remaining cerebellar remnant (red arrow). ( C ) A sagittal 3D-T1-weighted image shows the hypoplasia of the inferior cerebellar vermis (white triangle). Axial 3D-T1-weighted images ( B, D ) show ipsilateral enlargement of the pons and cerebral peduncle (thick, white arrow). ( E, F ) DTI shows fibrous connections between the pons and cerebellar remnants (white arrow).
The two patients included in this study did not present the expected clinical symptoms, suggesting potential functional compensation in the absence of unilateral cerebellar hemisphere. Motivated by this observation, our study aimed to comprehensively investigate the mechanisms of functional compensation corresponding to structural changes. Initially, we assessed the gray matter volume (GMV) of supratentorial brain structure using FreeSurfer ( http://surfer.nmr.mgh.harvard.edu/vision v.5.3.0). The detailed process of GMV reconstruction using FreeSurfer v.5.3 has been described and validated elsewhere (Bigl et al ., 1982 ; Boddaert et al ., 2003 ). In brief, the T1-weighted imaging data were preprocessed using FreeSurfer software, and the bilateral brain hemispheres were segmented according to the Desikan–Killiany atlas to calculate the average GMV of each brain region. Then, we compared the GMV of the two patients with age-matched controls from a normal brain model. This model was constructed based on a sample of >600 healthy participants aged 12 to 65 years old from West China Hospital of Sichuan University and validated in other hospitals. It was tailored for age groups spanning 10 years, with the 95% confidence intervals (CI) of GMV serving as the lower and upper thresholds for each group. Subsequently, we utilized BrainNet Viewer to visualize the GMV ratio between abnormal brain regions and their corresponding normal counterparts. The GMV in Case 1 was compared with the normal range of GMV determined by age-matched controls in this model. The GMV over the normal upper threshold indicated an increase in GMV (represented as a positive ratio), while the GMV below the normal lower threshold indicated a reduction in GMV (represented as a negative ratio). The GMV values within the normal range were represented by “0.” So was Case 2. As illustrated in Fig. 3 (Case 1), Fig. 4 (Case 2), as well as summarized in Table 1 , both patients exhibited increased GMV in multiple brain regions, with significant alterations observed in the frontal and temporal lobes, as well as the cingulate gyrus. Additionally, changes were noted in the accumbens, pallidum, and thalamus. These findings highlight both commonalities and differences, with more extensive and pronounced alterations observed in Case 2. Furthermore, our analysis revealed a slight decrease in GMV in the five regions, as detailed in Table 1 .
![how to do academic literature review Brain regions showing significantly altered GMV in the patient in Case 1. Warm colours indicate increased GMV, and cool colours represent decreased GMV when compared with an age-matched normal brain model.](https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/psyrad/4/10.1093_psyrad_kkae012/1/m_kkae012fig3.jpeg?Expires=1724564415&Signature=qe~bPMX426ldR9-kpE~MdacHL6yL32CJlC3y~r9zVR-j6QRdr0gpuzgXRK58pjoSTKZU1r~a3S-Nh7w4E40zNF7srqXYGVjPqvTbzlBU3mo0EJ6aoLuyClk3g6qrOxLdfAuzBXX3PGHFt8ZGL3Umcpeh57hfGMCFb18uVZSXTWDthxkdrS510kIsEEWHFu3CZmNhBB0CH734nmB9Ydy9VXK-rBQVfVEh2kjD~vh9Eh~F4zRsqCx92bUV4J0qSkRc7F1d~NcT34F2vUKvBcZReQg4CcGD452S10TEQU90Emk4wAWVTQJQFWdjwHZl84W0xBRzkWSaSmT-vxoSkkVhwA__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Brain regions showing significantly altered GMV in the patient in Case 1. Warm colours indicate increased GMV, and cool colours represent decreased GMV when compared with an age-matched normal brain model.
![how to do academic literature review Brain regions showing significantly altered GMV in the patient in Case 2. Warm colours indicate increased GMV, and cool colours represent decreased GMV when compared with an age-matched normal brain model.](https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/psyrad/4/10.1093_psyrad_kkae012/1/m_kkae012fig4.jpeg?Expires=1724564415&Signature=nOeQ4GjOs89czsSOnf9k-xMM35xc-ZcxFq7tqBaoK5g~J0L73NwWiHRNDlAqCKY4hp3up3vRbanFZ~vDkJUb3VKbOhiJCFPxikeiXEUrhZvm3YwRl49H2i7sMb8e9NHIiLLqIaJYrA7U9wY1v1BUvvybJIANle2Zo~bNo5xE5jp~g~77lJLZWvIgBx43xZ5p8O8WKc-vu8XZdyIT3ZpZejF15b3oQsC11njWZzOJ0iXUevQ17VthEsqgnDdlDoRhaBuKXL~aOsPpVVJE8vb3HkuM9B6HSdzCjj2jKjBg0masvrIeLC7UpwfxZDxhwL2tjpH1ynzjIQj0pcaURUw7zw__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Brain regions showing significantly altered GMV in the patient in Case 2. Warm colours indicate increased GMV, and cool colours represent decreased GMV when compared with an age-matched normal brain model.
Altered cerebrum GMV in each patient compared to an age-matched normal model brain.
. | Case 1 . | Case 2 . | ||
---|---|---|---|---|
Brain region . | Left . | Right . | Left . | Right . |
Increased regions | ||||
lateral orbitofrontal | 0.125 | 0.025 | 0.233 | 0.172 |
medial orbitofrontal | 0.153 | 0 | 0.139 | 0.054 |
parsopercularis | 0.155 | 0 | 0.258 | 0.127 |
parsorbitalis | 0.096 | 0.112 | 0.273 | 0.264 |
parstriangularis | 0.114 | 0 | 0.224 | 0 |
rostral middle frontal | 0.166 | 0.087 | 0.279 | 0.137 |
superior frontal | 0 | 0 | 0.229 | 0.022 |
entorhinal | 1.178 | 1.005 | 0.676 | 0.769 |
fusiform | 0.286 | 0.088 | 0.208 | 0.137 |
parahippocampal | 0.809 | 0 | 0.857 | 0 |
inferior parietal | 0.140 | 0 | 0.230 | 0.073 |
postcentral | 0.051 | −0.115 | 0.201 | −0.05 |
supramarginal | 0 | 0.203 | 0 | 0.367 |
lateral occipital | 0 | 0 | 0.016 | 0.032 |
lingual | 0.068 | 0.170 | 0.093 | 0.370 |
caudal anterior cingulate | −0.030 | 0 | 0 | 0.200 |
isthmus cingulate | 0 | 0.007 | 0 | 0.153 |
posterior cingulate | 0 | 0.071 | 0.009 | 0.227 |
pallidum | 0 | 0 | 0.126 | 0.106 |
accumbens | 0 | 0.130 | 0 | 0.105 |
thalamusproper | 0.039 | 0.063 | 0.141 | 0.184 |
Decreased regions | ||||
caudal anterior cingulate | −0.030 | 0 | 0 | |
caudal middle frontal | −0.276 | −0.016 | −0.050 | 0.200 |
postcentral | 0.051 | −0.115 | 0.201 | 0 |
precentral | 0 | −0.010 | 0 | −0.050 |
superiortemporal | 0 | −0.028 | 0 | 0 |
. | Case 1 . | Case 2 . | ||
---|---|---|---|---|
Brain region . | Left . | Right . | Left . | Right . |
Increased regions | ||||
lateral orbitofrontal | 0.125 | 0.025 | 0.233 | 0.172 |
medial orbitofrontal | 0.153 | 0 | 0.139 | 0.054 |
parsopercularis | 0.155 | 0 | 0.258 | 0.127 |
parsorbitalis | 0.096 | 0.112 | 0.273 | 0.264 |
parstriangularis | 0.114 | 0 | 0.224 | 0 |
rostral middle frontal | 0.166 | 0.087 | 0.279 | 0.137 |
superior frontal | 0 | 0 | 0.229 | 0.022 |
entorhinal | 1.178 | 1.005 | 0.676 | 0.769 |
fusiform | 0.286 | 0.088 | 0.208 | 0.137 |
parahippocampal | 0.809 | 0 | 0.857 | 0 |
inferior parietal | 0.140 | 0 | 0.230 | 0.073 |
postcentral | 0.051 | −0.115 | 0.201 | −0.05 |
supramarginal | 0 | 0.203 | 0 | 0.367 |
lateral occipital | 0 | 0 | 0.016 | 0.032 |
lingual | 0.068 | 0.170 | 0.093 | 0.370 |
caudal anterior cingulate | −0.030 | 0 | 0 | 0.200 |
isthmus cingulate | 0 | 0.007 | 0 | 0.153 |
posterior cingulate | 0 | 0.071 | 0.009 | 0.227 |
pallidum | 0 | 0 | 0.126 | 0.106 |
accumbens | 0 | 0.130 | 0 | 0.105 |
thalamusproper | 0.039 | 0.063 | 0.141 | 0.184 |
Decreased regions | ||||
caudal anterior cingulate | −0.030 | 0 | 0 | |
caudal middle frontal | −0.276 | −0.016 | −0.050 | 0.200 |
postcentral | 0.051 | −0.115 | 0.201 | 0 |
precentral | 0 | −0.010 | 0 | −0.050 |
superiortemporal | 0 | −0.028 | 0 | 0 |
Cerebellar agenesis (CA) was initially reported by Combettes ( 1831 ) and has since been sporadically documented, manifesting a spectrum of clinical features ranging from severe neurological deficits to cases with normal or nearly normal development. Vascular events during pregnancy, genetic factors, and intrauterine infection are widely recognized as the most common etiologies. The possibility of a vascular event in Case 1 was ruled out based on the presence of the residual posterior inferior cerebellar artery in the left cerebellar hemisphere (Fig. 1B , C). Moreover, intrauterine infection was hypothesized to be the primary etiology, given the significant intrauterine infections during pregnancy. Additionally, in Case 2, the likelihood of vascular or infectious events was excluded, considering the uneventful pregnancy and the presence of a residual artery (Fig. 2B ), consistent with the findings in Case 1.
The highlight of this study is the comparison of GMV between the two patients and an age-matched normal brain model, respectively, which has not been reported before. We observed varying degrees of increased GMV in multiple brain regions, particularly in the frontal, temporal, cingulate gyrus, and some deep brain nuclei. According to van der Heijden et al . ( 2023 ), the brain can compensate for some, but not all, perturbations to the developing cerebellum, including motor deficits and impairments in social behaviors. We speculate that the relatively mild clinical symptoms observed in our patients are largely attributed to functional compensation resulting from increased GMV.
Both patients demonstrated a notable increase in GMV within the frontal lobe, particularly in Case 2. In addition, the patient in Case 1 exhibited no significant increase in the superior frontal gyrus, a region implicated in emotional processing (Hong et al ., 2024 ) and previously reported to show abnormal function among individuals diagnosed with major depressive disorder (Liu et al ., 2024 ). Therefore, we hypothesize that the presence of depressive symptoms in Case 1 may be attributed, at least in part, to the lack of compensatory changes in the superior frontal gyrus.
Another region that exhibited significant differences between the two patients was the cingulate gyrus. A recent study used electrical cortical stimulation found that the cingulate gyrus is involved in a variety of complex functions, including sensory, affective, and motor functions (Xue et al ., 2023 ). The symptomatic patient exhibited no significant volume change in the cingulate gyrus, whereas the asymptomatic patient demonstrated a significant volume increase in the right cingulate gyrus. Hence, the potential compensatory effects of the cingulate gyrus cannot be disregarded.
The increased GMV in the temporal lobe was mainly located in the parahippocampal, entorhinal, and fusiform areas, which are part of the limbic circuit and associated with neuropsychiatric symptoms, cognitive abilities, and communication skills (Kolc et al ., 2019 ). Within the parietal lobe, regions showing increased GMV were mainly located in the inferior parietal, postcentral, and supramarginal areas, which play important roles in the arousal system (Jiang et al ., 2022 ), somatosensory processing and integration, coordination of upper limb movements (Kenzie et al ., 2024 ), and tactile categorization and decision-making (Lee et al ., 2023 ). GMV changes in these brain regions exhibited similarity between the two patients.
In addition to the cerebral cortex, the pallidum and thalamus of asymptomatic patient exhibited a marked increase in GMV. The outputs from the pallidum re-enter corticolimbic loops via direct projections to prefrontal cortex and dense projections to the mediodorsal nucleus of the thalamus, which then relays to prefrontal cortex (Bigl et al ., 1982 ; Pirot et al ., 1994 ; Churchill et al ., 1996 ; Zahm, 2000 ). Such limbic-related anatomical connectivity lays the foundation for mediating reward and facilitating the translation of movement at the brain level. Unlike the pallidum and thalamus, the accumbens exhibited similar GMV changes in both patients.
Furthermore, unilateral CA patients may not consistently present with ipsilateral cerebellar remnants, contralateral cerebellar hemisphere enlargement, or ipsilateral enlargement of the pons and cerebral peduncle. However, the patient in Case 2 exhibited all three conditions, consistent with those reported in asymptomatic CA patients by Erdogan et al . ( 2002 ) and Kilickesmez et al . ( 2004 ). Additionally, the absence or hypoplasia of the vermis warrants attention. Tavano et al . ( 2007 ) observed that malformations involving the cerebellar vermis often lead to affective and social disorder, frequently associated with autism, presenting similar MRI changes and clinical symptoms to those of our symptomatic patient. Moreover, literature reports indicate that ~50% of children with Dandy–Walker malformations have normal cognitive development, which is linked to normal vermian lobulation (Boddaert et al ., 2003 ). Although the involvement of the cerebellar vermis often, but not consistently, correlates with poorer cognitive outcomes, an intact vermis typically corresponds to normal clinical manifestations.
Some limitations of this artical should be considered. First, we refrained from providing a summary of previously reported cases of CA due to the potential for duplicate reporting. For example, Poretti et al . ( 2010 ) reported seven patients with absent cerebellar hemisphere from seven different institutions; however, it remains unclear whether these cases have been reported on elsewhere. Additionally, CA is heterogeneous condition that may manifest as an isolated anatomical anomaly or as part of a more complex cerebral malformation. Moreover, the nomenclature used in previous studies to describe the absence of cerebellar hemispheres is inconsistent. Some authors refer to this condition as CA, whereas others use the term “cerebellar hypoplasia” or describe it directly as the absence of cerebellar hemispheres. Therefore, to avoid duplication or incomplete data, we have opted not to provide a detailed summary of CA cases. Instead, our focus is on exploring potential compensatory mechanisms underlying the diverse clinical manifestations of this condition.
In conclusion, it is plausible to assert that unilateral CA, in the absence of other comorbidities, is compatible with an honorable existence, even allowing for a normal or nearly normal life. However, the type and extent of cerebral reorganization processes in CA patients are challenging to predict and could contribute to the variability in clinical phenotypes.
Dingmei Deng (Writing – original draft), Bo Tao (Methodology), Yizhi Yuan (Methodology), Yongsheng Ao (Formal analysis), and Lihua Qiu (Writing – review & editing)
None declared.
We thank the two patients for allowing us to report on their cases.
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Step 5 - Write your literature review. Like any other academic text, your literature review should have an introduction, a main body, and a conclusion. What you include in each depends on the objective of your literature review. Introduction. The introduction should clearly establish the focus and purpose of the literature review.
A literature review is an integrated analysis-- not just a summary-- of scholarly writings and other relevant evidence related directly to your research question. That is, it represents a synthesis of the evidence that provides background information on your topic and shows a association between the evidence and your research question.
Writing a Literature Review. A literature review is a document or section of a document that collects key sources on a topic and discusses those sources in conversation with each other (also called synthesis ). The lit review is an important genre in many disciplines, not just literature (i.e., the study of works of literature such as novels ...
he simplest thing of all—structure. Everything you write has three components: a beginning, a middle and an e. d and each serves a different purpose. In practice, this means your review will have an introduction, a main body where you review the literature an. a conclusion where you tie things up.
Example: Predictors and Outcomes of U.S. Quality Maternity Leave: A Review and Conceptual Framework: 10.1177/08948453211037398 ; Systematic review: "The authors of a systematic review use a specific procedure to search the research literature, select the studies to include in their review, and critically evaluate the studies they find." (p. 139).
3. Evaluate and select literature. 4. Analyze the literature. 5. Plan the structure of your literature review. 6. Write your literature review. Other resources to help you write a successful literature review.
Literature reviews establish the foundation of academic inquires. However, in the planning field, we lack rigorous systematic reviews. In this article, through a systematic search on the methodology of literature review, we categorize a typology of literature reviews, discuss steps in conducting a systematic literature review, and provide suggestions on how to enhance rigor in literature ...
Writing a literature review requires a range of skills to gather, sort, evaluate and summarise peer-reviewed published data into a relevant and informative unbiased narrative. Digital access to research papers, academic texts, review articles, reference databases and public data sets are all sources of information that are available to enrich ...
The best proposals are timely and clearly explain why readers should pay attention to the proposed topic. It is not enough for a review to be a summary of the latest growth in the literature: the ...
How to write a literature review in 6 steps. How do you write a good literature review? This step-by-step guide on how to write an excellent literature review covers all aspects of planning and writing literature reviews for academic papers and theses.
A literature review is a review or discussion of the current published material available on a particular topic. It attempts to synthesizeand evaluatethe material and information according to the research question(s), thesis, and central theme(s). In other words, instead of supporting an argument, or simply making a list of summarized research ...
Steps to Completing a Literature Review. Conduct searches for relevant information. Critically review your sources. Create a synthesis matrix to find connections between resources, and ensure your sources relate to your main ideas. Use the synthesis matrix to organize your literature review. Integrate the individual main ideas to put together ...
Step One: Decide on your areas of research: Before you begin to search for articles or books, decide beforehand what areas you are going to research. Make sure that you only get articles and books in those areas, even if you come across fascinating books in other areas. A literature review I am currently working on, for example, explores ...
Writing a literature review requires a range of skills to gather, sort, evaluate and summarise peer-reviewed published data into a relevant and informative unbiased narrative. Digital access to research papers, academic texts, review articles, reference databases and public data sets are all sources of information that are available to enrich ...
What is a literature review? A literature review is a piece of academic writing demonstrating knowledge and understanding of the academic literature on a specific topic placed in context. A literature review also includes a critical evaluation of the material; this is why it is called a literature review rather than a literature report. It is a ...
When searching the literature for pertinent papers and reviews, the usual rules apply: be thorough, use different keywords and database sources (e.g., DBLP, Google Scholar, ISI Proceedings, JSTOR Search, Medline, Scopus, Web of Science), and. look at who has cited past relevant papers and book chapters.
Preparing a literature review involves: Searching for reliable, accurate and up-to-date material on a topic or subject. Reading and summarising the key points from this literature. Synthesising these key ideas, theories and concepts into a summary of what is known. Discussing and evaluating these ideas, theories and concepts.
Ultimately, a well-conducted literature review supports your qualitative research paper and contributes to the academic community by mapping out the current state of knowledge and highlighting areas for further questions and investigation. Literature reviews are also valuable tools for other researchers who need to find a summary of the field ...
As a general rule, your literature review should: Explain why your research topic is important. Provide a critical analysis of the ideas in the literature rather than just describe the findings. Organise ideas into themes rather than by source. Identify similarities and differences in opinions, evidence and the findings of sources.
Personal: To familiarize yourself with a new area of research, to get an overview of a topic, so you don't want to miss something important, etc. Required writing for a journal article, thesis or dissertation, grant application, etc. Literature reviews vary; there are many ways to write a literature review based on discipline, material type ...
Each field has a particular way to do reviews for academic research literature. In the social sciences and humanities the most common are: Narrative Reviews: The purpose of this type of review is to describe the current state of the research on a specific research topic and to offer a critical analysis of the literature reviewed.
The introduction to a literature review serves as your reader's guide through your academic work and thought process. Explore the significance of literature review introductions in review papers, academic papers, essays, theses, and dissertations. We delve into the purpose and necessity of these introductions, explore the essential components of literature review introductions, and provide ...
A sophisticated literature review (LR) can result in a robust dissertation/thesis by scrutinizing the main problem examined by the academic study; anticipating research hypotheses, methods and results; and maintaining the interest of the audience in how the dissertation/thesis will provide solutions for the current gaps in a particular field.
Health Sciences Literature Review Made Easy is the ultimate 'how to' guide for learning the practical and useful methods for reviewing scientific literature in the health sciences. This text is an outstanding resource for students who need a practical, step-by-step set of instructions for how to organize, conduct, and write a synthesis of ...
The following steps are recommended when conducting a systematic literature review: Define the research question : Clearly state the research question(s) you intend to answer, ensuring it is specific, open-ended, and suitable for detailed exploration.
As mentioned previously, there are a number of existing guidelines for literature reviews. Depending on the methodology needed to achieve the purpose of the review, all types can be helpful and appropriate to reach a specific goal (for examples, please see Table 1).These approaches can be qualitative, quantitative, or have a mixed design depending on the phase of the review.
Moreover, literature reports indicate that ~50% of children with Dandy-Walker malformations have normal cognitive development, which is linked to normal vermian lobulation (Boddaert et al., 2003). Although the involvement of the cerebellar vermis often, but not consistently, correlates with poorer cognitive outcomes, an intact vermis ...
Academic integrity tools: Creating PeerMark assignments guidance: Class and assignment management: Creating and managing QuickMarks, rubrics and grading PeerMark assignments guidance: Grading and feedback: User profile guidance for administrators and instructors: User profile settings. Administrator account settings and migration help ...
All would have suited our needs perfectly. Each was also itemised with specific criteria picked out, so that we could easily compare like with like. Research for these projects can be time-consuming and difficult, but using the services of Academic Venue Solutions made the decision making process very simple and easy. Date of experience: 30 ...
With 8 years of tutoring/teaching experience and a passion for working with high school and college students, I tutor SAT/ACT/GRE prep, AP courses/test prep, college essay composition, and all academic courses (apart from chemistry) offered in the U.S. from 4th-12th grade and 1st-2nd year of college (math, science, humanities based subjects ...