Σύγκριση μεθόδων

	Θεωρία Γενικευσιμότητας (G-Theory)	Διεκτιμητική Αξιοπιστία (κ του Cohen και ICC)
Πεδίο	Ψυχομετρία	Ψυχομετρία
Οικογένεια	Latent structure	Latent structure
Έτος προέλευσης	1963	1960 (kappa); 1979 (ICC)
Δημιουργός	Lee J. Cronbach and colleagues	Cohen (kappa, 1960); Shrout & Fleiss (ICC, 1979)
Τύπος	ANOVA-based variance-component framework	Reliability / agreement analysis
Θεμελιώδης πηγή	Brennan, R. L. (2001). Generalizability Theory. Springer.	Cohen, J. (1960). A Coefficient of Agreement for Nominal Scales. Educational and Psychological Measurement, 20(1), 37–46.
Εναλλακτικές ονομασίες	Generalizability Theory, G-Study / D-Study framework, Genellenebilirlik Kuramı (G-Kuramı)	inter-rater reliability, interrater agreement, rater agreement, Değerlendiriciler Arası Güvenilirlik (Cohen's κ, ICC)
Συναφείς	6	6
Σύνοψη	Generalizability Theory, developed by Lee J. Cronbach and colleagues in the 1960s and formalised by Brennan (2001), is an ANOVA-based framework that extends Classical Test Theory by decomposing observed score variance into multiple, separately identified sources of measurement error — such as raters, tasks, occasions, or items — rather than bundling all error into a single undifferentiated term.	Interrater reliability quantifies the degree to which two or more independent raters produce consistent scores when evaluating the same individuals or products. The family encompasses Cohen's kappa, introduced in 1960 for categorical judgments, and the Intraclass Correlation Coefficient (ICC) for continuous ratings, together spanning most measurement scenarios encountered in behavioral, health, and educational research.