Σύγκριση μεθόδων

	Τεχνική Delphi	Έρευνα με Δείγμα
Πεδίο	Μεθοδολογία Επισκοπήσεων	Μεθοδολογία Επισκοπήσεων
Οικογένεια	Process / pipeline	Process / pipeline
Έτος προέλευσης	1950s–1963	Late 19th century; systematic social-science use from 1940s
Δημιουργός	Norman Dalkey and Olaf Helmer (RAND Corporation)	Francis Galton, Charles Booth, and early social statisticians; formalised by Paul Lazarsfeld in the 1940s
Τύπος	Iterative expert consensus technique	Quantitative (primarily) or mixed-methods data-collection instrument
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.	Dillman, D. A., Smyth, J. D., & Christian, L. M. (2014). Internet, Phone, Mail, and Mixed-Mode Surveys: The Tailored Design Method (4th ed.). Wiley. ISBN: 978-1118456149
Εναλλακτικές ονομασίες	Delphi method, Delphi survey, expert consensus method, iterative expert panel	questionnaire survey, survey research, self-report survey, questionnaire study
Συναφείς	6	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.	A survey is a systematic data-collection method in which a standardised set of questions is posed to a sample of respondents to measure attitudes, behaviours, demographics, or other constructs. Surveys can be administered via paper, telephone, online platforms, or face-to-face. They are among the most widely used instruments in social, behavioural, health, and educational research because they can reach large, geographically dispersed samples at relatively low cost.