This article presents evidence from a large-scale randomized controlled trial of the effects of four supplemental reading comprehension curricula (Project CRISS, ReadAbout, Read for Real, and Reading for Knowledge). The impact analyses in the study's first year revealed a statistically...

This article examines the effectiveness of four distinct elementary school math curricula: Investigations in Number, Data, and Space®; Math Expressions; Saxon Math™; and Scott Foresman-Addison Wesley Mathematics (SFAW). An average-performing first-grader's percentile rank in math would...

State assessments are increasingly used as outcome measures for education evaluations, and such evaluations generally use pretest scores as control variables. The correlation between the pretest and outcome (posttest) measures is a factor in determining, among other things, a study's statistical...