So sánh phương pháp

	Nhóm tập trung dọc	Nghiên cứu nhóm tập trung
Lĩnh vực	Phương pháp luận khảo sát	Định tính
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1940s (focus groups); longitudinal variant refined 1980s–1990s	1940s (sociological origin); modern applied form from the 1980s–1990s
Người khởi xướng	Adapted from Robert K. Merton's focused interview tradition; longitudinal design developed in social and health sciences	Robert K. Merton (sociological precursor, 1940s); popularised in applied research by Richard A. Krueger
Loại	Qualitative longitudinal data collection	Qualitative data collection method
Công trình gốc	Morgan, D. L. (1997). Focus Groups as Qualitative Research (2nd ed.). Sage Publications. ISBN: 978-0761903437	Krueger, R.A. & Casey, M.A. (2014). Focus Groups: A Practical Guide for Applied Research (5th ed.). Sage. ISBN: 978-1483365244
Tên gọi khác	repeated focus group, panel focus group, longitudinal FG, follow-up focus group	focus group discussion, FGD, group interview, Odak Grup Araştırması
Liên quan	5	6
Tóm tắt	A longitudinal focus group convenes the same group of participants in multiple sessions over an extended period — weeks, months, or years — to trace how their attitudes, experiences, or interpretations evolve in response to changing circumstances. Unlike a single focus group snapshot, the repeated-contact design captures the dynamics of opinion and meaning-making across time, making it particularly valuable in health, policy, and social research where change is the phenomenon of interest.	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.