In many practical testing situations, alternate test forms from the same testing program are not strictly parallel to each other and instead the test forms exhibit small psychometric differences. This article investigates the potential practical impact that these small psychometric differences can have on expected classification accuracy. Ten…

U.S. state educational testing programs administer tests to track student progress and hold schools accountable for educational outcomes. Methods from item response theory, especially Rasch models, are usually used to equate different forms of a test. The most popular method for estimating Rasch models yields inconsistent estimates and relies on…

This book summarizes the evaluation by the Committee on the General Aptitude Test Battery (GATB) of the National Research Council of the U.S. Employment Service's use of the GATB. The book serves professional users, policymakers, and students of psychometrics because of its clear and concise review of important issues. (SLD)