This study was conducted in order to evaluate available linking techniques for forming large item pools and to make recommendations as to which techniques should be used under various circumstances. Variables of interest included calibration model and procedure, sample size, overlap level, and linking procedure. The calibration models considered…

As part of its academic testing program and the evaluation of academic achievement, the Des Moines (Iowa) Public School System administers two standardized, norm-referenced achievement tests. These are the Iowa Tests of Basic Skills (ITBS) and the Iowa Tests of Educational Development (ITED). This document provides information regarding…