So sánh phương pháp

	Phỏng vấn sâu	Nghiên cứu nhóm tập trung	Lý thuyết Nền tảng
Lĩnh vực	Định tính	Định tính	Nghiên cứu định tính
Họ	Process / pipeline	Process / pipeline	Process / pipeline
Năm ra đời	Mid-20th century (formalised in qualitative social research from the 1950s onward)	1940s (sociological origin); modern applied form from the 1980s–1990s	1967
Người khởi xướng	Rooted in sociological interviewing traditions; systematised by researchers including Steinar Kvale and Herbert J. Rubin	Robert K. Merton (sociological precursor, 1940s); popularised in applied research by Richard A. Krueger	Barney Glaser and Anselm Strauss
Loại	Qualitative research method	Qualitative data collection method	Method
Công trình gốc	Kvale, S. (1996). InterViews: An Introduction to Qualitative Research Interviewing. Sage. ISBN: 978-0803958203	Krueger, R.A. & Casey, M.A. (2014). Focus Groups: A Practical Guide for Applied Research (5th ed.). Sage. ISBN: 978-1483365244	Glaser, B. G., & Strauss, A. L. (1967). The discovery of grounded theory: Strategies for qualitative research. Aldine.
Tên gọi khác	IDI, semi-structured interview, unstructured interview, qualitative interview	focus group discussion, FGD, group interview, Odak Grup Araştırması	GT, Grounded Theory Approach
Liên quan	6	6	3
Tóm tắt	The in-depth interview is a one-to-one qualitative data-collection method in which a researcher engages a participant in an extended, open-ended conversation to elicit rich, detailed accounts of experiences, perceptions, beliefs, or meanings. Unlike structured surveys, the interview guide serves as a flexible road map rather than a fixed script, allowing the researcher to probe unexpected directions as they emerge. The approach is foundational to qualitative inquiry and is used directly as a primary method or as the data-collection arm of phenomenology, grounded theory, narrative analysis, and other frameworks.	Focus group research is a qualitative data-collection method in which a trained moderator guides structured discussions with homogeneous groups of six to ten participants to explore ideas, attitudes, and perceptions on a defined topic. Developed from sociological roots in the 1940s and systematised for applied research by Krueger and Casey, the method leverages group interaction as a data source — revealing not just what people think, but how they negotiate and articulate views in a social setting.	Grounded Theory (GT) is a systematic qualitative research methodology in which theory emerges directly from data through iterative analysis, rather than being imposed before data collection. Developed by Barney Glaser and Anselm Strauss in 1967, GT prioritizes generating explanatory frameworks grounded in evidence.