example of critical instance case study

What is case study research?

Last updated

8 February 2023

Reviewed by

Cathy Heath

Suppose a company receives a spike in the number of customer complaints, or medical experts discover an outbreak of illness affecting children but are not quite sure of the reason. In both cases, carrying out a case study could be the best way to get answers.

Organization

Case studies can be carried out across different disciplines, including education, medicine, sociology, and business.

Most case studies employ qualitative methods, but quantitative methods can also be used. Researchers can then describe, compare, evaluate, and identify patterns or cause-and-effect relationships between the various variables under study. They can then use this knowledge to decide what action to take. 

Another thing to note is that case studies are generally singular in their focus. This means they narrow focus to a particular area, making them highly subjective. You cannot always generalize the results of a case study and apply them to a larger population. However, they are valuable tools to illustrate a principle or develop a thesis.

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• What are the different types of case study designs?

Researchers can choose from a variety of case study designs. The design they choose is dependent on what questions they need to answer, the context of the research environment, how much data they already have, and what resources are available.

Here are the common types of case study design:

Explanatory

An explanatory case study is an initial explanation of the how or why that is behind something. This design is commonly used when studying a real-life phenomenon or event. Once the organization understands the reasons behind a phenomenon, it can then make changes to enhance or eliminate the variables causing it. 

Here is an example: How is co-teaching implemented in elementary schools? The title for a case study of this subject could be “Case Study of the Implementation of Co-Teaching in Elementary Schools.”

Descriptive

An illustrative or descriptive case study helps researchers shed light on an unfamiliar object or subject after a period of time. The case study provides an in-depth review of the issue at hand and adds real-world examples in the area the researcher wants the audience to understand. 

The researcher makes no inferences or causal statements about the object or subject under review. This type of design is often used to understand cultural shifts.

Here is an example: How did people cope with the 2004 Indian Ocean Tsunami? This case study could be titled "A Case Study of the 2004 Indian Ocean Tsunami and its Effect on the Indonesian Population."

Exploratory

Exploratory research is also called a pilot case study. It is usually the first step within a larger research project, often relying on questionnaires and surveys . Researchers use exploratory research to help narrow down their focus, define parameters, draft a specific research question , and/or identify variables in a larger study. This research design usually covers a wider area than others, and focuses on the ‘what’ and ‘who’ of a topic.

Here is an example: How do nutrition and socialization in early childhood affect learning in children? The title of the exploratory study may be “Case Study of the Effects of Nutrition and Socialization on Learning in Early Childhood.”

An intrinsic case study is specifically designed to look at a unique and special phenomenon. At the start of the study, the researcher defines the phenomenon and the uniqueness that differentiates it from others. 

In this case, researchers do not attempt to generalize, compare, or challenge the existing assumptions. Instead, they explore the unique variables to enhance understanding. Here is an example: “Case Study of Volcanic Lightning.”

This design can also be identified as a cumulative case study. It uses information from past studies or observations of groups of people in certain settings as the foundation of the new study. Given that it takes multiple areas into account, it allows for greater generalization than a single case study. 

The researchers also get an in-depth look at a particular subject from different viewpoints.  Here is an example: “Case Study of how PTSD affected Vietnam and Gulf War Veterans Differently Due to Advances in Military Technology.”

Critical instance

A critical case study incorporates both explanatory and intrinsic study designs. It does not have predetermined purposes beyond an investigation of the said subject. It can be used for a deeper explanation of the cause-and-effect relationship. It can also be used to question a common assumption or myth. 

The findings can then be used further to generalize whether they would also apply in a different environment.  Here is an example: “What Effect Does Prolonged Use of Social Media Have on the Mind of American Youth?”

Instrumental

Instrumental research attempts to achieve goals beyond understanding the object at hand. Researchers explore a larger subject through different, separate studies and use the findings to understand its relationship to another subject. This type of design also provides insight into an issue or helps refine a theory. 

For example, you may want to determine if violent behavior in children predisposes them to crime later in life. The focus is on the relationship between children and violent behavior, and why certain children do become violent. Here is an example: “Violence Breeds Violence: Childhood Exposure and Participation in Adult Crime.”

Evaluation case study design is employed to research the effects of a program, policy, or intervention, and assess its effectiveness and impact on future decision-making. 

For example, you might want to see whether children learn times tables quicker through an educational game on their iPad versus a more teacher-led intervention. Here is an example: “An Investigation of the Impact of an iPad Multiplication Game for Primary School Children.” 

• When do you use case studies?

Case studies are ideal when you want to gain a contextual, concrete, or in-depth understanding of a particular subject. It helps you understand the characteristics, implications, and meanings of the subject.

They are also an excellent choice for those writing a thesis or dissertation, as they help keep the project focused on a particular area when resources or time may be too limited to cover a wider one. You may have to conduct several case studies to explore different aspects of the subject in question and understand the problem.

• What are the steps to follow when conducting a case study?

1. Select a case

Once you identify the problem at hand and come up with questions, identify the case you will focus on. The study can provide insights into the subject at hand, challenge existing assumptions, propose a course of action, and/or open up new areas for further research.

2. Create a theoretical framework

While you will be focusing on a specific detail, the case study design you choose should be linked to existing knowledge on the topic. This prevents it from becoming an isolated description and allows for enhancing the existing information. 

It may expand the current theory by bringing up new ideas or concepts, challenge established assumptions, or exemplify a theory by exploring how it answers the problem at hand. A theoretical framework starts with a literature review of the sources relevant to the topic in focus. This helps in identifying key concepts to guide analysis and interpretation.

3. Collect the data

Case studies are frequently supplemented with qualitative data such as observations, interviews, and a review of both primary and secondary sources such as official records, news articles, and photographs. There may also be quantitative data —this data assists in understanding the case thoroughly.

4. Analyze your case

The results of the research depend on the research design. Most case studies are structured with chapters or topic headings for easy explanation and presentation. Others may be written as narratives to allow researchers to explore various angles of the topic and analyze its meanings and implications.

In all areas, always give a detailed contextual understanding of the case and connect it to the existing theory and literature before discussing how it fits into your problem area.

• What are some case study examples?

What are the best approaches for introducing our product into the Kenyan market?

How does the change in marketing strategy aid in increasing the sales volumes of product Y?

How can teachers enhance student participation in classrooms?

How does poverty affect literacy levels in children?

Case study topics

Case study of product marketing strategies in the Kenyan market

Case study of the effects of a marketing strategy change on product Y sales volumes

Case study of X school teachers that encourage active student participation in the classroom

Case study of the effects of poverty on literacy levels in children

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Guide to case studies

What is a case study.

A case study is an in depth focussed study of a person, group, or situation that has been studied over time within its real-life context.

There are different types of case study:

• Illustrative case studies describe an unfamiliar situation in order to help people understand it.
• Critical instance case studies focus on a unique case, without a generalised purpose.
• Exploratory case studies are preliminary projects to help guide a future, larger-scale project. They aim to identify research questions and possible research approaches.

We are often looking to develop patient stories as case studies and these will use qualitative methods such as interviews to find specific details and descriptions of how your subject is affected.

Patient stories are illustrative or critical instance case studies. For example, an illustrative case study might focus on a patient with an eating disorder to provide a subjective view to better help trainee nutritionists understand the illness.  A critical instance case study might focus on a patient with a very rare or uniquely complex condition or how a single patient is affected by an injury.

How do you do a case study?

1. get prepared.

• Be very clear about the purpose of the case study, why you are doing it and what it will be used for?
• Think about the questions you want to answer? What are your research or evaluation questions?
• Determine what kind of case study will best suit your needs? Illustrative, Critical Instance or Exploratory?
• Define the subject of study – is it an individual, a small group of people, or a specific situation?
• Determine if you need ethical approval to conduct this case study – you may be asked to prove that the case study will do no harm to its participant(s).

2. Get designing!

• Finalise your research or evaluation questions – i.e. what you want to know at the end of the study. Limit these to a manageable number – no more than 4 or 5.
• Think about where you will find the information you need to answer your questions.  Interviewing research subjects and/ or observing will likely be the central methods of your case study, but do you need to look to additional data sources as well? For example, desk research or evidence/literature reviewing, interviewing experts, other fieldwork and so on.
• Create a plan outlining how you will gather the information you need to answer your research or evaluation questions. Include a timeframe and be clear that you have the resources and equipment to carry out the work. Depending on the nature of the case study or the topic being studied a case study may require several meetings/interviews over a period of many months, or it might need just a one off interview. What does yours need?
• Decide on the exact subject of the study. Is this a specific person or a small group of people? If yes, plan how you will get in touch with them and invite them to take part in the case study. How flexible can you be in terms of time and travel? Does this limit your access to potential participants?
• Design interview questions that are open and will enable the participant to provide in-depth answers. Avoid questions that can be answered with a single yes or no and make sure the questions are flexible and allow the participant to talk openly and freely.

3. Get recruiting!

• You may have a specific individual in mind, or specific criteria. You will need to invite people to participate and make very clear that they are able to withdraw at any point.
• You will need consent from the participants. Make sure the purpose of the case study, why you are doing it and what it will be used, the methods and time frames are extremely clear to the potential participants. You will need written consent that demonstrates that the participant understands this. Additionally, if you intend to digitally record an interview or take notes, make sure you have permission from the participants’ first.
• If your central method is observation, this will be open observation – the participant must be aware of your presence and agreed to it – you are not allowed to observe without the participants’ permission!

4. Get conducting!

• Interviewing – Agree a mutually suitable time and venue for the case study interview. This may be a one off or the first of many over several months. Make sure the participant is in an environment they are comfortable and able to talk in. Equally important, however is that the environment is safe for you and is conducive to conducting a case study interview – i.e.  If it is a private space, are you safe? If it is a public space make sure it is not too noisy or likely to be affected by interruptions.
• Decide what is the best method of recording the interview information – digital recording is less intrusive and you can engage better in the conversation, than if you attempt to just take notes. Taking notes can mean that your concentration is focused on the writing rather than the listening and you can miss vital points. It can also be off-putting for the participant if there is no eye contact because you are scribing throughout the conversation. However, some participants will not like to be digitally recorded – so it is best to discuss this with them first. If you are digitally recording always test the equipment first. Even if you are digitally recording you will still need to take notes on key points, or things that you would like to investigate further, questions that arise or points at which you don’t want to interrupt the conversation or anything that will not be captured by the recording, such as body language or other observations.
• Depending on the total length of your case study, you might hold a one off interview, interview weekly, once every month or two, or just once or twice a year. Begin with the interview questions you prepared in the preparation and design phases, then iterate to dig deeper into the topics. Ask about experience and meaning — ask the participant what it’s like to go through the experience you’re studying and what the experience means to them. Later interviews are an opportunity to ask questions that fill gaps in your knowledge, or that are particularly relevant to the development of the case study or in answering your questions.
• Observing – recording observation can be done manually – i.e. taking notes – or digitally via a camcorder or similar. It is important to capture detail about the subject/participant and their interactions with others and the environment, their behaviour and other context an detail that is relevant to your questions.

5. Get analysing!

• Write up your notes or transcribe (Interviews), make notes (video) from your digital recording. Remember that if you are transcribing it is important to include pauses, laughter and other descriptive sounds and commentary on tone and intonation to better convey the story. Include the contextual information / the external environment and other observations that are important. Such as when and where the interview took place (you will not necessarily make this public) and any issues that arose such as interruptions that affected the interview or if there were multiple interviews anything of significance that happened in the periods between interviews.
• Thematically code (look for themes) and look for key parts of the interviews that will answer your original questions. Also be very aware that the may be new or unexpected information that has come through the process that is very important or interesting.
• Arrange the notes or transcriptions from the interviews and, or observations into a case study. It is not likely that you will be able to use the transcriptions without reorganising them, but if you are rewriting the story in your own words, be careful not to lose the meaning and language that reflects the participant.

6. Get sign off!

• Once you have drafted your case study make sure the participant(s) have sight of it and an opportunity to say whether you have captured their story and are representing it/them as they would like.

7. Get disseminating!

• More information about disseminating evaluations and case studies can be found on the  Evaluation Toolkit site .
• Remember case studies are not designed for large group studies or statistical analysis and do not aim to answer a research question definitively.
• Do background/context research where possible.
• Establishing trust with participants is crucial and can result in less inhibited behaviour. Observing people in their home, workplaces, or other “natural” environments may be more effective than bringing them to a laboratory or office.
• Be aware that if you are observing it is likely that because subjects know they are being studied, their behaviour will change.
• Take notes -Extensive notes during observation will be vital.
• Take notes even if you are digitally recoding an interview to capture your own thinking, points to follow up on or observations.
• In some case studies, it may be appropriate to ask the participant to record experiences in a diary – especially if there are periods between your interviews or observations that you wish to capture data on.
• Stay rigorous. A case study may feel less data-driven than a medical trial or a scientific experiment, but attention to rigor and valid methodology remains vital.
• When reviewing your notes, discard possible conclusions that do not have detailed observation or evidence backing them up.
• A case study might reveal new and unexpected results, and lead to research taking new directions.
• A case study cannot be generalised to fit a whole population.
• Since you aren’t conducting a statistical analysis, you do not need to recruit a diverse cross-section of society. You should be aware of any biases in your small sample, and make them clear in your report, but they do not invalidate your research.
• Useful resource: ‘Case Study Research: Design and Methods’, Robert K Yin, SAGE publications 2013.

Case studies

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The Evaluation and Evidence toolkits go hand in hand. Using and generating evidence to inform decision making is vital to improving services and people’s lives.

The toolkits have been developed by the NHS Bristol, North Somerset and South Gloucestershire Integrated Care Board (BNSSG ICB), the National Institute for Health and Care Research Applied Research Collaboration West (NIHR ARC West) and Health Innovation West of England .

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Critical Instance Case Study

The critical instance case study entails assessing one of more than one site for two main purposes. In the sense that a thing of unique interest is examined, this is the very essence of this kind of the case study. Moreover, no attention is given to the generic information.

Usually in the second half critical instance case study that entails calling in to consideration a highly generalized and highly universally applicable assertion. This is done by testing it one specific instance. Moreover, this kind of method particularly is thought to be answering cause and effect queries that happen to be about an instance or concern. Inadequate specification of the evaluation question forms the most serious pitfall in this type of study. Appropriate application of the critical instance case study crucially involves probing the underlying concerns in a request.

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