Σύγκριση μεθόδων

	Τεχνική Delphi	Ανάλυση Περιεχομένου	Έρευνα Ομάδων Εστίασης
Πεδίο	Μεθοδολογία Επισκοπήσεων	Ποιοτικές Μέθοδοι	Ποιοτικές Μέθοδοι
Οικογένεια	Process / pipeline	Process / pipeline	Process / pipeline
Έτος προέλευσης	1950s–1963	Systematised through Krippendorff's methodology work; 4th edition 2018	1940s (sociological origin); modern applied form from the 1980s–1990s
Δημιουργός	Norman Dalkey and Olaf Helmer (RAND Corporation)	Klaus Krippendorff (systematic formulation); roots in early 20th-century communications research	Robert K. Merton (sociological precursor, 1940s); popularised in applied research by Richard A. Krueger
Τύπος	Iterative expert consensus technique	Qualitative / mixed-method research technique	Qualitative data collection method
Θεμελιώδης πηγή	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	Krueger, R.A. & Casey, M.A. (2014). Focus Groups: A Practical Guide for Applied Research (5th ed.). Sage. ISBN: 978-1483365244
Εναλλακτικές ονομασίες	Delphi method, Delphi survey, expert consensus method, iterative expert panel	İçerik Analizi, systematic content coding, quantitative content analysis	focus group discussion, FGD, group interview, Odak Grup Araştırması
Συναφείς	6	5	6
Σύνοψη	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.	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.