Vertaile menetelmiä

	Kolmioitu kysely	Verkkokysely	Puolistrukturoitu haastattelu
Tieteenala	Kyselytutkimuksen metodologia	Kyselytutkimuksen metodologia	Laadulliset menetelmät
Menetelmäperhe	Process / pipeline	Process / pipeline	Process / pipeline
Syntyvuosi	1978 (Denzin); widely operationalized in survey contexts from the 1990s onward	Mid-1990s (widespread scholarly adoption ~1995–2000)	1946 (Merton & Kendall); codified as a standard method through the 1980s–1990s
Kehittäjä	Norman K. Denzin (triangulation concept); Alan Bryman (mixed-methods survey application)	Mick P. Couper, Don A. Dillman (early systematic frameworks)	Robert K. Merton and Patricia Kendall (focused interview, 1946); further systematised by Steinar Kvale
Tyyppi	Mixed-methods data collection design	Quantitative / mixed-methods data collection technique	Qualitative research method
Alkuperäislähde	Denzin, N. K. (1978). The Research Act: A Theoretical Introduction to Sociological Methods (2nd ed.). McGraw-Hill.	Couper, M. P. (2000). Web surveys: A review of issues and approaches. Public Opinion Quarterly, 64(4), 464–494.	Kvale, S., & Brinkmann, S. (2009). InterViews: Learning the Craft of Qualitative Research Interviewing (2nd ed.). Sage. ISBN: 978-0761925422
Rinnakkaisnimet	survey triangulation, multi-method survey, convergent survey design, cross-validated survey	web survey, internet survey, e-survey, computer-assisted web interviewing	guided interview, semi-standardized interview, focused interview, SSI
Liittyvät	5	6	6
Tiivistelmä	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.	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.	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.