So sánh phương pháp

	Phương pháp Delphi	Phân tích nội dung	Nghiên cứu nhóm tập trung
Lĩnh vực	Định tính	Định tính	Định tính
Họ	Process / pipeline	Process / pipeline	Process / pipeline
Năm ra đời	1963	Systematised through Krippendorff's methodology work; 4th edition 2018	1940s (sociological origin); modern applied form from the 1980s–1990s
Người khởi xướng	Norman Dalkey & Olaf Helmer (RAND Corporation)	Klaus Krippendorff (systematic formulation); roots in early 20th-century communications research	Robert K. Merton (sociological precursor, 1940s); popularised in applied research by Richard A. Krueger
Loại	Structured iterative expert-elicitation process	Qualitative / mixed-method research technique	Qualitative data collection method
Công trình gốc	Dalkey, N. & Helmer, O. (1963). An Experimental Application of the Delphi Method to the Use of Experts. Management Science, 9(3), 458-467.	Krippendorff, K. (2018). Content Analysis: An Introduction to Its Methodology (4th ed.). Sage. ISBN: 978-1506395661	Krueger, R.A. & Casey, M.A. (2014). Focus Groups: A Practical Guide for Applied Research (5th ed.). Sage. ISBN: 978-1483365244
Tên gọi khác	Delphi Yöntemi, Delphi technique, expert consensus method	İçerik Analizi, systematic content coding, quantitative content analysis	focus group discussion, FGD, group interview, Odak Grup Araştırması
Liên quan	5	5	6
Tóm tắt	The Delphi method is a structured, iterative survey technique developed by Norman Dalkey and Olaf Helmer at the RAND Corporation in 1963 for eliciting and converging expert opinion on complex topics where empirical data are unavailable or insufficient. It collects independent judgements from a geographically dispersed expert panel over multiple anonymous rounds, feeding aggregated results back to participants after each round so they can revise their views in light of the group's collective position.	Content analysis is a systematic research technique for reducing text, visual, or media material into coded categories so that patterns can be counted, compared, and interpreted. Formalised by Klaus Krippendorff in his widely cited methodology textbook (latest edition 2018), the method sits at the boundary of qualitative and quantitative inquiry: it imposes structured, replicable coding on inherently meaning-laden material.	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.