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...

The Playworks program, an initiative of the Robert Wood Johnson Foundation, places full-time coaches in low-income schools to provide opportunities for organized play during recess and throughout the school day. Using random assignment, Mathematica and the John W. Gardner Center for Youth and...

This interim report from Mathematica's longitudinal study presents 18 months of follow-up data on families whose cases closed in early 1998 because of a time limit. Notes that nearly all parents worked at some point during the follow-up period, and most worked for more than half of it. Wages...

This study evaluated the effectiveness of four supplemental reading comprehension programs in helping disadvantaged fifth graders improve reading comprehension. The study, supported by the Institute of Education Sciences in the U.S. Department of Education and conducted over the course of two...

This article presents findings from the largest experimental evaluation to date of school-based mandatory-random student drug testing (MRSDT) and its effectiveness in reducing substance use among high school students. The study found that students who were subject to MRSDT reported less...