방법 비교

	다중 출처 심층 면접	종단적 심층 면접
분야	조사방법론	조사방법론
계열	Process / pipeline	Process / pipeline
기원 연도	1980s–1990s (formalized in qualitative inquiry literature)	1990s–2000s (as a formalised qualitative method)
창시자	Grounded in qualitative traditions consolidated by Patton, Lincoln & Guba, and others	Rooted in qualitative longitudinal research traditions; systematised by Johnny Saldana
유형	Qualitative data collection technique	Qualitative longitudinal data collection technique
원전	Patton, M. Q. (2002). Qualitative Research and Evaluation Methods (3rd ed.). Sage Publications. ISBN: 978-0761919711	Saldana, J. (2003). Longitudinal Qualitative Research: Analyzing Change Through Time. AltaMira Press. ISBN: 978-0759103917
별칭	multi-informant in-depth interview, multi-perspective qualitative interview, multiple-source IDI, multi-stakeholder in-depth interview	repeated in-depth interview, longitudinal qualitative interview, panel qualitative interview, longitudinal IDI
관련	5	5
요약	The multi-source in-depth interview is a qualitative data collection strategy in which extended, open-ended interviews are conducted with participants drawn from two or more distinct source groups — such as providers and clients, managers and staff, or experts and laypeople. Collecting data across diverse informant positions enriches description and enables the researcher to examine a phenomenon from multiple vantage points within a single study.	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.