This article provides two illustrations of some of the factors that can influence findings from pre- and post-test research designs in evaluation studies, including regression to the mean (RTM), maturation, history and test effects. The first illustration involves a re-analysis of data from a study by Marsden (2004), in which pre-test scores are…

This study examined whether teacher portfolios can be validly and reliably assessed by investigating the effect of an instructional tool on increasing the level of reflective thinking in elementary preservice teachers' portfolios. It also examined whether reflective thinking in preservice teachers' electronic portfolios represented sufficient…

Differential Item Functioning (DIF) is a group-related item/test characteristic targeting the issue of item/test bias. In this dissertation, a new DIF index is described that has three parts: (1) a DIF measure indicating the degree of different (item) performances between the reference and focal groups, (2) a DIF direction statement about the DIF…

The present study was carried out to find out whether regular administration of cloze test improved the students' knowledge of grammar more than the multiple choice one. Subjects participating in this study were 84 Iranian pre-university students of Allameh-Gotb-e Ravandi University, aged between 18 and 35 and enrolled in a grammar course. To…

Traditionally, the use of control groups, regression discontinuity/projection, or norm referenced models has been advocated for educational program evaluation. The small numbers of and the heterogeneous characteristics of severely and profoundly handicapped make these evaluation methods inappropriate for this population subgroup. Furthermore, no…

Examined discriminative validity of the Parent Rating Scale (PRS) of the Behavior Assessment System for Children (BASC; Reynolds & Kamphaus, 1992, Circle Pines, MN: American Guidance Services). Two groups were compared: a cohort with recurrent abdominal pain (RAP) (n = 49) and children from the BASC-PRS standardization sample (n = 49) matched…