Intrinsic Case Study — In-Depth Study of a Particular Case

In an intrinsic case study, the case is studied because it is inherently interesting — the researcher wants to understand this particular case in depth, and generalization is not the aim. In an instrumental case study, the case is selected to shed light on a broader issue or theory; the case is a vehicle for understanding something beyond itself. The distinction is about purpose: intrinsic = the case matters in itself; instrumental = the case serves a wider analytic goal.

Both involve immersive, multi-source qualitative data collection in a real-world setting. The key difference is focus and duration. Ethnography is primarily concerned with culture — shared meanings, practices, and social structures — and typically involves extended fieldwork over months or years. Intrinsic case study is concerned with understanding a bounded case as a particular event, programme, or unit; fieldwork may be shorter and the account is organised around the case rather than around cultural themes.

An intrinsic case study focuses on a single bounded case, but that case may be geographically distributed (e.g., a multi-site programme is still one programme). If you wish to compare two or more cases, each studied for its own interest, Stake's term is collective case study. Studying multiple separate cases to generalise or build theory is an instrumental or multiple-case design.

Stake emphasises thick description, triangulation across data sources, member checking, and transparency about the researcher's perspective (including what Stake calls the researcher's 'biases and interests'). He also endorses naturalistic generalisation — providing sufficient detail for readers to judge whether the case resonates with their own experience or context. Quality is judged by the coherence, richness, and credibility of the account, not by statistical metrics.

Naturalistic generalisation, a concept Stake developed with Egon Guba, refers to the understanding that readers construct for themselves when they recognise parallels between the case and their own experience. Unlike statistical generalisation, it is reader-driven rather than researcher-driven. A well-written intrinsic case study enables naturalistic generalisation by providing enough contextual detail that readers can make their own comparisons — which is why narrative richness is not just stylistic preference but an epistemological commitment.