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	Teoria della Generalizzabilità per Forme Brevi	Teoria della Generalizzabilità (G-Theory)
Campo	Psicometria	Psicometria
Famiglia	Latent structure	Latent structure
Anno di origine	1963–1972 (G-theory); short-form extension ongoing from 1980s	1963–1972
Ideatore	Lee J. Cronbach, Goldine Gleser, Harinder Nanda, Nageswari Rajaratnam	Lee J. Cronbach, Goldine Gleser, Harinder Nanda, Nageswari Rajaratnam
Tipo	Reliability / decision-study framework	Variance-components reliability model
Fonte seminale	Brennan, R. L. (2001). Generalizability Theory. Springer. ISBN: 978-0387952826	Cronbach, L. J., Gleser, G. C., Nanda, H. & Rajaratnam, N. (1972). The Dependability of Behavioral Measurements: Theory of Generalizability for Scores and Profiles. Wiley.
Alias	G-theory for abbreviated scales, short-form G-study, abbreviated test generalizability, short-form D-study	G-theory, G-study / D-study framework, variance components reliability
Correlati	5	4
Sintesi	Short form generalizability theory applies the G-theory variance-component framework to abbreviated measurement instruments, using G-studies and D-studies to estimate how many items a short scale must retain to achieve a desired reliability and to evaluate the accuracy of decisions made with a condensed instrument.	Generalizability Theory is a psychometric framework that decomposes observed score variance into multiple sources — persons, items, raters, occasions, and their interactions — using analysis of variance. It replaces the single reliability coefficient of classical test theory with a family of coefficients that tell researchers how well scores generalize across different measurement conditions.