A model which gives maximum likelihood estimates of measurement error within the context of a simplex model for practice effects is presented. The appropriateness of the model is tested for five traits, and error estimates are compared to the classical formula estimates. (Author/JKS)

An overview of the development of a computerized version of the Differential Aptitude Tests (DAT) is presented. It describes the previously existing printed version of the DAT, design of the computerized adaptive edition, calibration of the test items for use in the computerized version, and two field studies that compared the Adaptive and…

Language arts teachers participated in an inservice program, The Writer's Clinic, and evaluated their students' improvement in writing ability using holistic essay scoring techniques. Seventh and eighth grade students were administered an essay composition pretest in December; the same essay topic was given as the post test in May. Students were…