手法を比較

	フォーカスグループリサーチ	半構造化インタビュー	調査
分野	質的手法	質的手法	調査方法論
系統	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	1940s (sociological origin); modern applied form from the 1980s–1990s	1946 (Merton & Kendall); codified as a standard method through the 1980s–1990s	Late 19th century; systematic social-science use from 1940s
提唱者	Robert K. Merton (sociological precursor, 1940s); popularised in applied research by Richard A. Krueger	Robert K. Merton and Patricia Kendall (focused interview, 1946); further systematised by Steinar Kvale	Francis Galton, Charles Booth, and early social statisticians; formalised by Paul Lazarsfeld in the 1940s
種類	Qualitative data collection method	Qualitative research method	Quantitative (primarily) or mixed-methods data-collection instrument
原典	Krueger, R.A. & Casey, M.A. (2014). Focus Groups: A Practical Guide for Applied Research (5th ed.). Sage. ISBN: 978-1483365244	Kvale, S., & Brinkmann, S. (2009). InterViews: Learning the Craft of Qualitative Research Interviewing (2nd ed.). Sage. ISBN: 978-0761925422	Dillman, D. A., Smyth, J. D., & Christian, L. M. (2014). Internet, Phone, Mail, and Mixed-Mode Surveys: The Tailored Design Method (4th ed.). Wiley. ISBN: 978-1118456149
別名	focus group discussion, FGD, group interview, Odak Grup Araştırması	guided interview, semi-standardized interview, focused interview, SSI	questionnaire survey, survey research, self-report survey, questionnaire study
関連	6	6	6
概要	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.	The semi-structured interview is a qualitative data-collection method in which the researcher prepares a set of key questions or topic areas in advance but remains free to probe, follow up, and reorder as the conversation evolves. Unlike structured interviews — which fix every question and sequence — or unstructured interviews — which are entirely open — the semi-structured format balances comparability across participants with the flexibility needed to capture the depth and nuance of individual perspectives. It is the most widely used interview format in social science, health, and education research.	A survey is a systematic data-collection method in which a standardised set of questions is posed to a sample of respondents to measure attitudes, behaviours, demographics, or other constructs. Surveys can be administered via paper, telephone, online platforms, or face-to-face. They are among the most widely used instruments in social, behavioural, health, and educational research because they can reach large, geographically dispersed samples at relatively low cost.