手法を比較

	縦断的ライフヒストリー研究	縦断的ケーススタディ
分野	質的手法	質的手法
系統	Process / pipeline	Process / pipeline
提唱年	1918 (origins); longitudinal application developed from 1980s onward	1984–1990 (foundational methodological codification)
提唱者	Thomas & Znaniecki (Polish Peasant, 1918–1920); elaborated by Ken Plummer, Daniel Bertaux	Robert K. Yin (case study methodology); Andrew M. Pettigrew (longitudinal field research)
種類	Qualitative longitudinal research design	Qualitative research design
原典	Plummer, K. (2001). Documents of Life 2: An Invitation to a Critical Humanism. Sage. ISBN: 978-0761952244	Yin, R. K. (2018). Case Study Research and Applications: Design and Methods (6th ed.). Sage. ISBN: 978-1506336169
別名	longitudinal biographical research, life history longitudinal design, repeated life history study, longitudinal oral biography	longitudinal case research, panel case study, repeated case study, temporal case study
関連	6	6
概要	Longitudinal life history research follows the same participants across multiple points in time, collecting repeated in-depth accounts of how their life stories evolve, how they narrate past events differently over time, and how biography intersects with social change. It combines the interpretive depth of life history methodology with the temporal sensitivity of longitudinal design, capturing both the content of lived experience and its unfolding across the life course.	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.