مقایسهٔ روش‌ها

	تکنیک دلفی	تحلیل محتوا	تکنیک گروه اسمی	مصاحبه ساختاریافته
حوزه	روش‌شناسی پیمایش	کیفی	کیفی	روش‌شناسی پیمایش
خانواده	Process / pipeline	Process / pipeline	Process / pipeline	Process / pipeline
سال پیدایش	1950s–1963	Systematised through Krippendorff's methodology work; 4th edition 2018	1971	1940s–1950s
پدیدآور	Norman Dalkey and Olaf Helmer (RAND Corporation)	Klaus Krippendorff (systematic formulation); roots in early 20th-century communications research	André L. Delbecq and Andrew H. Van de Ven	Survey research tradition; formalized by Campbell, Katona, and Kahn in mid-20th century
نوع	Iterative expert consensus technique	Qualitative / mixed-method research technique	Qualitative research method	Quantitative / mixed data collection technique
منبع بنیادین	Dalkey, N., & Helmer, O. (1963). An experimental application of the Delphi method to the use of experts. Management Science, 9(3), 458–467.	Krippendorff, K. (2018). Content Analysis: An Introduction to Its Methodology (4th ed.). Sage. ISBN: 978-1506395661	Delbecq, A. L., & Van de Ven, A. H. (1971). A group process model for problem identification and program planning. Journal of Applied Behavioral Science, 7(4), 466–492.	Fontana, A., & Frey, J. H. (2000). The interview: From structured questions to negotiated text. In N. K. Denzin & Y. S. Lincoln (Eds.), Handbook of Qualitative Research (2nd ed., pp. 645–672). Sage.
نام‌های دیگر	Delphi method, Delphi survey, expert consensus method, iterative expert panel	İçerik Analizi, systematic content coding, quantitative content analysis	NGT, structured group process, nominal group process, priority-setting group method	standardized interview, formal interview, schedule-based interview, fixed-format interview
مرتبط	6	5	6	4
خلاصه	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.	Content analysis is a systematic research technique for reducing text, visual, or media material into coded categories so that patterns can be counted, compared, and interpreted. Formalised by Klaus Krippendorff in his widely cited methodology textbook (latest edition 2018), the method sits at the boundary of qualitative and quantitative inquiry: it imposes structured, replicable coding on inherently meaning-laden material.	The Nominal Group Technique (NGT) is a structured group facilitation method designed to generate and prioritise ideas, problems, or solutions while ensuring equal participation from all members. Developed by Delbecq and Van de Ven in 1971, it combines silent individual idea generation with structured group discussion and systematic voting to produce a ranked list of priorities. Unlike unstructured focus groups, NGT prevents dominant voices from suppressing quieter participants, making it especially valuable for needs assessment, program planning, and stakeholder priority-setting in applied research and policy contexts.	A structured interview is a data collection technique in which every participant is asked exactly the same pre-specified questions in the same order, using standardized wording. Because the interview schedule is fixed, responses across participants are directly comparable, enabling quantitative aggregation and statistical analysis. It sits at the most standardized end of the interview continuum, between the self-administered questionnaire and the semi-structured interview.