Methoden vergelijken

	Short Form Generalizability Theory	Short-Form Item Response Theory (SF-IRT)
Vakgebied	Psychometrie	Psychometrie
Familie	Latent structure	Latent structure
Jaar van ontstaan	1963–1972 (G-theory); short-form extension ongoing from 1980s	1980s–2000s
Grondlegger	Lee J. Cronbach, Goldine Gleser, Harinder Nanda, Nageswari Rajaratnam	Multiple contributors; IRT adapted to short-form contexts from Lord & Novick (1968) and subsequent applied psychometricians
Type	Reliability / decision-study framework	Latent trait / item calibration model
Oorspronkelijke bron	Brennan, R. L. (2001). Generalizability Theory. Springer. ISBN: 978-0387952826	Embretson, S. E. & Reise, S. P. (2000). Item Response Theory for Psychologists. Lawrence Erlbaum Associates. ISBN: 978-0805828191
Aliassen	G-theory for abbreviated scales, short-form G-study, abbreviated test generalizability, short-form D-study	SF-IRT, abbreviated scale IRT, short-form calibration, shortened instrument IRT
Verwant	5	6
Samenvatting	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.	Short-form item response theory applies IRT calibration and scoring to abbreviated or shortened psychological scales. It uses item information functions to guide which items to retain from a full-length instrument, then estimates latent trait scores from the reduced item set while preserving psychometric rigor and linkage to the full-scale metric.