Exploring the Different Types of Case Studies in Research

Every significant media event – a newspaper’s editorial collapse, a viral misinformation campaign, a broadcaster’s controversial coverage of a crisis – holds lessons that researchers want to capture and study. The tool they most frequently reach for is the case study. But choosing to do a case study is just the starting point. The more important decision is what kind of case study you are conducting. Get that wrong, and your entire research design is misaligned. According to the Utah Journal of Communication, case studies are typically defined not by their subject matter but by the intent of the case analysis – and that intent determines everything from how you select your case to how you interpret your findings. The three core types, first systematized by qualitative research scholar Robert E. Stake in his 1995 landmark work The Art of Case Study Research, are the intrinsic, the instrumental, and the collective case study.

The foundation: what makes a case study a “case study”? 🔗

Before diving into the three types, it helps to be clear on what a case study actually is in the context of communication research. A peer-reviewed paper published in BMC Medical Research Methodology defines it as a research approach that enables in-depth, multi-faceted exploration of complex issues in their real-life settings. In communication and media studies, the “case” could be a single journalist, a media organization, a specific broadcast episode, a PR crisis, or an online community’s response to breaking news. What ties all case studies together is their commitment to depth over breadth – they answer the “how” and “why” questions that surveys and statistics cannot.

What separates one type from another, as Research Design Review explains, is whether the researcher’s primary focus stays within the case itself or reaches beyond it toward a broader theory, phenomenon, or generalization. This internal-versus-external orientation is the clearest way to understand Stake’s three-part classification.

Intrinsic case studies: the case is the point 🔗

An intrinsic case study is undertaken when the researcher has a genuine, primary interest in that specific case – not because it represents something larger, and not to build or test a theory. The case is studied simply because it is inherently interesting or unique in its own right. As iResearchNet’s Communication encyclopedia puts it, the purpose of an intrinsic case study is not theory building – the researcher wants a better, richer understanding of this particular case, and that is sufficient justification.

Key characteristics 🔗

The defining trait of an intrinsic case study is that the case itself is the primary focus. The researcher is not using the case as a vehicle to reach some other destination. Research Design Review notes that in Stake’s framework, intrinsic cases are those where the subject is important in its own right – not necessarily because of any predictive or theoretical power it may carry. The research findings are also largely internal: they inform our understanding of that specific case and are not intended to be transferred wholesale to other situations.

In practice, an intrinsic study is characterized by dense, rich, “thick” description. The researcher wants readers to feel immersed in the specifics – the timeline, the context, the key actors, and the nuances of what happened. The narrative depth is the point.

A communication research example 🔗

Consider a researcher studying the 2022 closure of a specific regional newspaper – say, a long-running local daily that served a mid-sized city for over a century. The researcher is not studying this case to make arguments about the broader collapse of local journalism in general. They are studying this paper, in this community, during this specific period, because the case itself is historically significant and uniquely complex. They will pour over internal memos, interview former editors, analyze the paper’s final issues, and document the community’s reaction. The outcome is an exhaustive portrait of that single closure – intrinsically valuable, not a stand-in for anything else.

Instrumental case studies: the case serves a larger purpose 🔗

An instrumental case study flips the logic. Here, the specific case is secondary; what matters is what the case can teach us about a broader issue, concept, or phenomenon. The SAGE Encyclopedia of Case Study Research defines it as the study of a particular case – a person, group, organization, or event – in order to provide insight into a broader issue, redraw generalizations, or build theory. The case facilitates understanding of something else.

Key characteristics 🔗

In an instrumental study, the researcher typically arrives with a pre-existing research question or theoretical framework. The case is then selected because it is well-positioned to illuminate that question – it does not have to be the most dramatic or the most representative example, just one that offers useful access to the phenomenon being studied. As Keith Taber of the University of Cambridge describes it, the case is extrinsic – studied not for its own value but for what it reveals about a wider class of situations.

The researcher constantly moves back and forth between the specific details of the case and the abstract concept they are investigating. The case report focuses less on the full complexity of the case, and more on the specifics that are relevant to the research question at hand.

A communication research example 🔗

Suppose a researcher wants to understand the ethical limits of algorithmic content moderation on social media platforms. They select the well-documented 2021 de-platforming of a high-profile political figure from Twitter as their case. The specific individual and the specific event are not what they are truly interested in – they are using that case as a lens through which to examine the broader legal, ethical, and regulatory questions around platform power and free expression. The case is instrumental: it serves the research question, rather than being the research question.

Collective case studies: patterns across multiple cases 🔗

The collective case study – also called the multiple case study – extends the instrumental approach across several cases simultaneously or sequentially. Crowe et al., writing in BMC Medical Research Methodology, describe it as the study of multiple cases in an attempt to generate a broader understanding of a particular issue. Rather than relying on one case to illuminate a phenomenon, the researcher draws on several, looking for patterns, similarities, and divergences across the set.

Key characteristics 🔗

The defining analytical technique in collective case research is cross-case analysis. Each case is first analyzed on its own terms (within-case analysis), and then the researcher looks for themes that hold across all of them. The Utah Journal of Communication explains that the goal of a multiple case study is to compare cases to identify common patterns, relationships, or similarities – with cases that may be similar in nature, or deliberately diverse, depending on the research design.

One significant advantage of the collective approach is that it reduces the risk of anomalous findings. If a pattern appears in only one case, it might be a fluke. If the same pattern appears across three or five carefully selected cases, the evidence becomes far more convincing. As the CO:RE Research Methods Toolkit notes, these categories are not entirely mutually exclusive – an instrumental study may well be extended into a collective one, and the boundary between types can sometimes blur in practice.

A communication research example 🔗

A researcher wants to understand how public broadcasters in different countries covered the COVID-19 pandemic during its first wave in 2020. Instead of studying just one broadcaster, they examine the BBC (UK), ABC (Australia), and Doordarshan (India) as three separate but connected cases. Each case is analyzed for its editorial choices, tone, and accuracy. The cross-case analysis then reveals whether there are universal patterns in public broadcasting during health crises, or whether national context shapes coverage in fundamentally different ways. No single case could have produced that comparative insight.

How the three types compare: a quick reference 🔗

The table below captures the essential distinctions between the three types at a glance.

The key takeaway is that the difference between intrinsic and instrumental case studies is not the case itself, but the purpose of the study. As the SAGE Encyclopedia makes clear, researchers often have multiple interests and may find that a study begins as intrinsic and evolves into instrumental as new questions emerge. Crowe et al. describe exactly this transition in their own work on recruiting minority ethnic participants into asthma research – what began as an intrinsic study of one specific program eventually developed into an instrumental one as the transferable findings became apparent.

Choosing the right type: why it matters early 🔗

The type of case study you choose is not a label you add at the end – it shapes your research design from the very beginning. It determines how you select your case, what data you collect, how deeply you describe context, and how you frame your conclusions. National University’s research guidance underscores that case study design should be chosen based on careful alignment between the research question and the type of data needed to address it.

If you are conducting an intrinsic study, your energy goes into archival depth, rich interviews, and exhaustive contextual description. If you are conducting an instrumental study, you build your case selection around an existing research question or theoretical gap and ensure your chosen case offers useful access to the phenomenon. If you are conducting a collective study, you invest heavily in case selection strategy – ensuring that your chosen cases are varied enough to generate meaningful comparison but connected enough by the phenomenon you are studying.

Misidentifying the type – or ignoring the question altogether – is one of the most common methodological weaknesses in published case study research. Research Design Review cites a review of over 100 published articles that found the majority did not include any discussion of the type of case study or its methodological foundations. That ambiguity undermines the credibility of findings and makes it harder to situate research within the broader academic conversation.

The adaptability of the case study method 🔗

What makes Stake’s three-type framework so enduring is that it reflects the genuine flexibility of case study research. The method can be turned inward to preserve the particularity of a single extraordinary event. It can be turned outward to use one case as a window into a systemic issue. Or it can be expanded into a comparative lens across multiple sites, cultures, or organizations. Research published in the International Journal of Work-Integrated Learning captures this well: case study gives the researcher the ability to explore a phenomenon through a variety of lenses, and this multi-perspective approach is what makes it so powerful for understanding complex, real-life situations.

For communication researchers in particular – working in a field where context is everything, where a story’s meaning shifts depending on the platform, the audience, and the moment in history – the adaptability of the case study is not a weakness. It is its greatest strength.

What do you think? If you were designing a research project around a recent media controversy – say, a news outlet’s editorial decision that sparked public backlash – would you approach it as an intrinsic case study focused purely on that event, or as an instrumental one aimed at understanding broader questions of editorial accountability? And do you think studying multiple similar controversies across different outlets simultaneously would produce more credible findings than focusing on just one?

References

1. https://ujoc.org/case-study-research-defined/
2. https://pmc.ncbi.nlm.nih.gov/articles/PMC3141799/
3. https://researchdesignreview.com/2018/01/17/case-study-research-an-internal-external-classification/
4. https://communication.iresearchnet.com/research-methods/case-studies/
5. https://methods.sagepub.com/ency/edvol/encyc-of-case-study-research/chpt/instrumental-case-study
6. https://science-education-research.com/research-methodology/case-study/instrumental-case-studies/
7. https://core-evidence.eu/posts/methods-toolkit-qual-case-study
8. https://resources.nu.edu/c.php?g=1013605&p=8554624
9. https://files.eric.ed.gov/fulltext/EJ1196748.pdf