Since grade-appropriate levels of standardized achievement tests must frequently be used in Elementary and Secondary Education Act Title I evaluations, there may be large discrepancies between test difficulty and the achievement level of those being tested, with resultant inaccuracies in the scores. Procedures based on the Rasch scaling model were…

The effectiveness of the Elementary and Secondary Education Act Title I reading and mathematics laboratories were evaluated to assess the improvement of underachieving elementary school students' academic skills. Laboratory students were selected on the basis of academic (rather than socioeconomic) criteria in grades 2 through 5; the control…