So sánh phương pháp

	Phỏng vấn sâu	Dân tộc học	Nghiên cứu nhóm tập trung
Lĩnh vực	Định tính	Định tính	Định tính
Họ	Process / pipeline	Process / pipeline	Process / pipeline
Năm ra đời	Mid-20th century (formalised in qualitative social research from the 1950s onward)	c. 1922 (Malinowski's Argonauts of the Western Pacific)	1940s (sociological origin); modern applied form from the 1980s–1990s
Người khởi xướng	Rooted in sociological interviewing traditions; systematised by researchers including Steinar Kvale and Herbert J. Rubin	Bronisław Malinowski (modern ethnography); rooted in 19th-century anthropology	Robert K. Merton (sociological precursor, 1940s); popularised in applied research by Richard A. Krueger
Loại	Qualitative research method	Qualitative fieldwork tradition	Qualitative data collection method
Công trình gốc	Kvale, S. (1996). InterViews: An Introduction to Qualitative Research Interviewing. Sage. ISBN: 978-0803958203	Hammersley, M. & Atkinson, P. (2019). Ethnography: Principles in Practice (4th ed.). Routledge. ISBN: 978-1138504462	Krueger, R.A. & Casey, M.A. (2014). Focus Groups: A Practical Guide for Applied Research (5th ed.). Sage. ISBN: 978-1483365244
Tên gọi khác	IDI, semi-structured interview, unstructured interview, qualitative interview	Etnografi, participant observation, fieldwork, ethnographic research	focus group discussion, FGD, group interview, Odak Grup Araştırması
Liên quan	6	5	6
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.	Ethnography is a qualitative research tradition in which a researcher immerses themselves in a social group or community over an extended period — typically three to six months or longer — to study its culture, values, and behaviours in their natural setting. Originating in social and cultural anthropology, and consolidated as a rigorous method by Bronisław Malinowski in the early twentieth century, ethnography produces rich, contextualised accounts of how people live, work, and make meaning together.	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.