手法を比較

	時間的グラウンデッド・セオリー	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	1990s–2000s (as a recognized variant of grounded theory)	1984–1990 (foundational methodological codification)
提唱者	Kathy Charmaz and longitudinal qualitative researchers (building on Glaser & Strauss)	Robert K. Yin (case study methodology); Andrew M. Pettigrew (longitudinal field research)
種類	Qualitative longitudinal research design	Qualitative research design
原典	Charmaz, K. (2006). Constructing Grounded Theory: A Practical Guide through Qualitative Analysis. Sage. ISBN: 978-0761973522	Yin, R. K. (2018). Case Study Research and Applications: Design and Methods (6th ed.). Sage. ISBN: 978-1506336169
別名	LGT, longitudinal GT, temporal grounded theory, grounded theory longitudinal design	longitudinal case research, panel case study, repeated case study, temporal case study
関連	5	6
概要	Longitudinal grounded theory is a qualitative research design that applies grounded theory's inductive, iterative logic to data collected from the same participants or settings across multiple time points. It is used to build substantive theory that accounts not only for social processes but also for how those processes unfold, shift, and are renegotiated over time. The approach is particularly suited to studying change, trajectory, and temporal experience in social and health research.	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.