手法を比較

	短縮版一般化可能性理論	一般化可能性理論（G理論）
分野	心理測定学	心理測定学
系統	Latent structure	Latent structure
提唱年	1963–1972 (G-theory); short-form extension ongoing from 1980s	1963–1972
提唱者	Lee J. Cronbach, Goldine Gleser, Harinder Nanda, Nageswari Rajaratnam	Lee J. Cronbach, Goldine Gleser, Harinder Nanda, Nageswari Rajaratnam
種類	Reliability / decision-study framework	Variance-components reliability model
原典	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.
別名	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
関連	5	4
概要	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.