手法を比較

	コンテンツ分析	Delphi Method	フォーカスグループリサーチ
分野	質的手法	質的手法	質的手法
系統	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	Systematised through Krippendorff's methodology work; 4th edition 2018	1963	1940s (sociological origin); modern applied form from the 1980s–1990s
提唱者	Klaus Krippendorff (systematic formulation); roots in early 20th-century communications research	Norman Dalkey & Olaf Helmer (RAND Corporation)	Robert K. Merton (sociological precursor, 1940s); popularised in applied research by Richard A. Krueger
種類	Qualitative / mixed-method research technique	Structured iterative expert-elicitation process	Qualitative data collection method
原典	Krippendorff, K. (2018). Content Analysis: An Introduction to Its Methodology (4th ed.). Sage. ISBN: 978-1506395661	Dalkey, N. & Helmer, O. (1963). An Experimental Application of the Delphi Method to the Use of Experts. Management Science, 9(3), 458-467.	Krueger, R.A. & Casey, M.A. (2014). Focus Groups: A Practical Guide for Applied Research (5th ed.). Sage. ISBN: 978-1483365244
別名	İçerik Analizi, systematic content coding, quantitative content analysis	Delphi Yöntemi, Delphi technique, expert consensus method	focus group discussion, FGD, group interview, Odak Grup Araştırması
関連	5	5	6
概要	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.	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.	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.