手法を比較

	縦断的半構造化インタビュー	経時的深度インタビュー
分野	調査方法論	調査方法論
系統	Process / pipeline	Process / pipeline
提唱年	1990s–2000s (as explicit methodology)	1990s–2000s (as a formalised qualitative method)
提唱者	Rooted in longitudinal qualitative research traditions; systematised by Johnny Saldana and Rachel Thomson & Janet Holland	Rooted in qualitative longitudinal research traditions; systematised by Johnny Saldana
種類	Qualitative longitudinal data collection technique	Qualitative longitudinal data collection technique
原典	Saldana, J. (2003). Longitudinal Qualitative Research: Analyzing Change Through Time. AltaMira Press. ISBN: 978-0759100480	Saldana, J. (2003). Longitudinal Qualitative Research: Analyzing Change Through Time. AltaMira Press. ISBN: 978-0759103917
別名	LSI, repeated semi-structured interview, panel qualitative interview, longitudinal qualitative interview	repeated in-depth interview, longitudinal qualitative interview, panel qualitative interview, longitudinal IDI
関連	6	5
概要	A longitudinal semi-structured interview study collects open-ended, guided interview data from the same participants across multiple time points. By returning to the same individuals — weeks, months, or years apart — researchers can trace how experiences, perceptions, and meanings change over time. The approach blends the flexibility of qualitative inquiry with the temporal depth that is impossible in a one-shot design, making it a cornerstone method in qualitative longitudinal research.	Longitudinal in-depth interviewing is a qualitative data collection technique in which the same participants are interviewed in depth on multiple occasions across a defined time span. By revisiting the same people over weeks, months, or years, researchers can trace how experiences, identities, attitudes, and meanings change — something a single interview cannot reveal. It is widely used in life-course research, health studies, education, and social policy.