手法を比較

	縦断的複数事例研究	長期的民族誌研究
分野	質的手法	質的手法
系統	Process / pipeline	Process / pipeline
提唱年	1980s–2000s (Yin's multiple-case framework c. 1984; longitudinal qualitative elaboration c. 2003)	1920s (classical origins); refined 1990s–2000s
提唱者	Robert K. Yin (multiple case design); Johnny Saldana (longitudinal qualitative methods)	Rooted in classical anthropological fieldwork (Malinowski, 1922); systematised for sociological revisits by Michael Burawoy (2003)
種類	Qualitative longitudinal research design	Qualitative research design
原典	Yin, R. K. (2018). Case Study Research and Applications: Design and Methods (6th ed.). Sage. ISBN: 978-1506336169	Burawoy, M. (2003). Revisits: An outline of a theory of reflexive ethnography. American Sociological Review, 68(5), 645–679.
別名	longitudinal multi-case study, repeated multiple case study, panel case study, multi-site longitudinal case study	extended ethnography, long-term fieldwork, sustained ethnographic study, longitudinal field research
関連	6	5
概要	Longitudinal multiple case study is a qualitative research design that examines two or more bounded cases through repeated data-collection waves over an extended period. By tracking each case across time and comparing patterns across cases, researchers can document how phenomena change, stabilise, or diverge — generating both depth within each site and breadth across sites that neither a single case nor a one-shot survey can provide.	Longitudinal ethnography is a qualitative research design in which a researcher conducts sustained, repeated fieldwork with the same community, organisation, or group across an extended period — months to decades. By returning to the field at multiple time points, the researcher captures how social processes, meanings, and structures evolve, making it the only qualitative method capable of directly observing change and continuity in lived experience.