Addresses generalizability theory (GT), which offers a flexible framework for assessing dependability of measurement. GT allows for consideration of multiple sources of error, allowing investigators to assess the overall impact of measurement error. Illustrative analyses demonstrate the special advantages of GT for planning studies in which…

A measurement approach called generalizability theory (G-theory) is an important alternative to the more familiar classical measurement theory that yields less useful coefficients such as alpha or the KR-20 coefficient. G-theory is a theory about the dependability of behavioral measurements that allows the simultaneous estimation of multiple…