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	Longitudinal In-depth Interview	Dagboksmetoden
Ämnesområde	Surveymetodik	Surveymetodik
Familj	Process / pipeline	Process / pipeline
Ursprungsår	1990s–2000s (as a formalised qualitative method)	1920s–1940s (systematised by Allport, 1942)
Upphovsperson	Rooted in qualitative longitudinal research traditions; systematised by Johnny Saldana	Gordon Allport (systematic social-science use); Nels Anderson (early fieldwork diaries)
Typ	Qualitative longitudinal data collection technique	Qualitative / mixed-methods data-collection technique
Ursprungskälla	Saldana, J. (2003). Longitudinal Qualitative Research: Analyzing Change Through Time. AltaMira Press. ISBN: 978-0759103917	Alaszewski, A. (2006). Using Diaries for Social Research. Sage. ISBN: 978-0761941415
Alias	repeated in-depth interview, longitudinal qualitative interview, panel qualitative interview, longitudinal IDI	diary study, diary technique, self-report diary, daily diary method
Närliggande	5	5
Sammanfattning	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.	The diary method is a data-collection technique in which participants record their thoughts, behaviours, events, or experiences in their own words at regular or event-contingent intervals over a defined study period. By capturing data close in time to the event, diaries reduce retrospective recall bias and give researchers access to the texture of everyday life as it unfolds — something one-off surveys and retrospective interviews cannot provide.