手法を比較

	三角測量調査	フォーカスグループリサーチ	オンライン調査
分野	調査方法論	質的手法	調査方法論
系統	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	1978 (Denzin); widely operationalized in survey contexts from the 1990s onward	1940s (sociological origin); modern applied form from the 1980s–1990s	Mid-1990s (widespread scholarly adoption ~1995–2000)
提唱者	Norman K. Denzin (triangulation concept); Alan Bryman (mixed-methods survey application)	Robert K. Merton (sociological precursor, 1940s); popularised in applied research by Richard A. Krueger	Mick P. Couper, Don A. Dillman (early systematic frameworks)
種類	Mixed-methods data collection design	Qualitative data collection method	Quantitative / mixed-methods data collection technique
原典	Denzin, N. K. (1978). The Research Act: A Theoretical Introduction to Sociological Methods (2nd ed.). McGraw-Hill.	Krueger, R.A. & Casey, M.A. (2014). Focus Groups: A Practical Guide for Applied Research (5th ed.). Sage. ISBN: 978-1483365244	Couper, M. P. (2000). Web surveys: A review of issues and approaches. Public Opinion Quarterly, 64(4), 464–494.
別名	survey triangulation, multi-method survey, convergent survey design, cross-validated survey	focus group discussion, FGD, group interview, Odak Grup Araştırması	web survey, internet survey, e-survey, computer-assisted web interviewing
関連	5	6	6
概要	A Triangulated Survey deliberately combines a structured survey instrument with at least one additional data source — such as interviews, focus groups, observation, or a second survey — so that findings from each source can be cross-validated against the others. Rooted in Denzin's concept of methodological triangulation, the design strengthens credibility by checking whether independent lines of evidence converge on the same conclusions. It is especially common in applied social, educational, and health research.	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.	An online survey is a structured data collection instrument hosted on a web platform and completed by respondents via internet-connected devices. It enables large-scale, geographically dispersed data gathering at low cost and with rapid turnaround. Respondents self-administer the questionnaire at their convenience, which reduces interviewer bias and permits automatic data capture. Online surveys are the dominant mode of survey research in social, behavioural, health, and market research today.