So sánh phương pháp

	Thiết kế Khảo sát Tam giác	Khảo sát trực tuyến
Lĩnh vực	Phương pháp luận khảo sát	Phương pháp luận khảo sát
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1978 (Denzin); widely operationalized in survey contexts from the 1990s onward	Mid-1990s (widespread scholarly adoption ~1995–2000)
Người khởi xướng	Norman K. Denzin (triangulation concept); Alan Bryman (mixed-methods survey application)	Mick P. Couper, Don A. Dillman (early systematic frameworks)
Loại	Mixed-methods data collection design	Quantitative / mixed-methods data collection technique
Công trình gốc	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.
Tên gọi khác	survey triangulation, multi-method survey, convergent survey design, cross-validated survey	web survey, internet survey, e-survey, computer-assisted web interviewing
Liên quan	5	6
Tóm tắt	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.