Experimental evaluations are increasingly common in the U.S. educational policy-research context. Often, in investigations of multifaceted interventions, researchers and policymakers alike are interested in not only "whether" a given intervention impacted an outcome but also "why". What "features" of the intervention…

The study reviewed in this paper examined whether "Playworks," a program that utilizes full-time coaches to provide structured play opportunities during recess and class time, reduces the number of disciplinary referrals in low-income elementary schools. Study authors randomly assigned 25 schools in five US cities to either a…

Students in the United States spend much less time in school than do students in most other industrialized nations, and the school year has been essentially unchanged for more than a century. This is not to say that there is no interest in extending the school year. While there has been little solid evidence that doing so will improve learning…

Tracking students into different classrooms according to their prior academic performance is controversial among both scholars and policymakers. If teachers find it easier to teach a homogeneous group of students, tracking could enhance school effectiveness and raise test scores of both low- and high-ability students. If students benefit from…

Social norms-based interventions targeting college student drinking behaviors have become increasingly popular. Such interventions purportedly modify student misperceptions of fellow student drinking behaviors, which leads to changes in individual drinking behavior. Despite claims of successful interventions, research demonstrating that social…

This article outlines a learning intervention which the authors call Learning by Design. The goal of this intervention is classroom and curriculum transformation, and the professional learning of teachers. The experiment involves the practical application of the learning theory to everyday classroom practice. Its ideas are grounded in pedagogical…