So sánh phương pháp

	Kỹ thuật Delphi	Khảo sát trực tuyến
Lĩnh vực	Phương pháp luận khảo sát	Phương pháp luận khảo sát
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1950s–1963	Mid-1990s (widespread scholarly adoption ~1995–2000)
Người khởi xướng	Norman Dalkey and Olaf Helmer (RAND Corporation)	Mick P. Couper, Don A. Dillman (early systematic frameworks)
Loại	Iterative expert consensus technique	Quantitative / mixed-methods data collection technique
Công trình gốc	Dalkey, N., & Helmer, O. (1963). An experimental application of the Delphi method to the use of experts. Management Science, 9(3), 458–467.	Couper, M. P. (2000). Web surveys: A review of issues and approaches. Public Opinion Quarterly, 64(4), 464–494.
Tên gọi khác	Delphi method, Delphi survey, expert consensus method, iterative expert panel	web survey, internet survey, e-survey, computer-assisted web interviewing
Liên quan	6	6
Tóm tắt	The Delphi technique is a structured, multi-round data collection method that harvests and refines expert opinion through iterative questionnaires and controlled feedback. Developed at RAND Corporation in the 1950s, it is designed to converge a dispersed expert panel toward a reliable consensus on complex, uncertain, or future-oriented questions — without the conformity pressures of face-to-face group discussion.	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.