So sánh phương pháp

	Phỏng vấn sâu đa nguồn	Phỏng vấn sâu theo chiều dọc
Lĩnh vực	Phương pháp luận khảo sát	Phương pháp luận khảo sát
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1980s–1990s (formalized in qualitative inquiry literature)	1990s–2000s (as a formalised qualitative method)
Người khởi xướng	Grounded in qualitative traditions consolidated by Patton, Lincoln & Guba, and others	Rooted in qualitative longitudinal research traditions; systematised by Johnny Saldana
Loại	Qualitative data collection technique	Qualitative longitudinal data collection technique
Công trình gốc	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
Tên gọi khác	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
Liên quan	5	5
Tóm tắt	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.