Vertaile menetelmiä

	Pitkittäistutkimus	Toimintatutkimus	Tapaustutkimus
Tieteenala	Laadulliset menetelmät	Laadullinen tutkimus	Laadulliset menetelmät
Menetelmäperhe	Process / pipeline	Process / pipeline	Process / pipeline
Syntyvuosi	1984–1990 (foundational methodological codification)	1946	1984 (seminal codification)
Kehittäjä	Robert K. Yin (case study methodology); Andrew M. Pettigrew (longitudinal field research)	Kurt Lewin; expanded by Kemmis, McTaggart, Reason & Bradbury	Robert K. Yin (systematised in Case Study Research, 1984)
Tyyppi	Qualitative research design	Method	Qualitative research design
Alkuperäislähde	Yin, R. K. (2018). Case Study Research and Applications: Design and Methods (6th ed.). Sage. ISBN: 978-1506336169	Lewin, K. (1946). Action research and minority problems. Journal of Social Issues, 2(4), 34–46.	Yin, R.K. (2018). Case Study Research and Applications: Design and Methods (6th ed.). Sage. ISBN: 978-1506336169
Rinnakkaisnimet	longitudinal case research, panel case study, repeated case study, temporal case study	Participatory Action Research, PAR, Collaborative Inquiry	Vaka Çalışması (Case Study), case study design, case study methodology
Liittyvät	6	1	5
Tiivistelmä	A longitudinal case study is a qualitative research design that combines the in-depth, contextually rich focus of case study methodology with repeated data collection across multiple time points. Rather than capturing a single snapshot, it follows one or a small number of cases — an individual, group, organisation, or programme — over months or years to trace how processes, relationships, and meanings evolve. This design is well suited to questions about how and why things change, not merely what the state of affairs is at one moment.	Action research is a collaborative research methodology in which researchers work with practitioners and community members to investigate a problem, implement change, and evaluate outcomes, cycling through reflection, action, and learning. Developed by Kurt Lewin (1946), action research bridges research and practice, aiming simultaneously to produce knowledge and practical improvement.	Case study research is a qualitative research design that investigates a specific phenomenon, individual, group, organisation, or event in depth within its real-world context. Systematised by Robert K. Yin in 1984, it supports single-case and multiple-case designs and draws on multiple data sources — interviews, observation, documents, and artefacts — to build a rich, contextualised account of a bounded unit.