The present paper, which is intended for a diverse audience of evaluation researchers, applied social scientists, and research funders, provides a broad overview of the conceptual and statistical issues involved in using multisite randomized trials to learn "about" and "from" variation in program effects across…

This paper examines strategies for interpreting and reporting estimates of intervention effects for subgroups of a study sample. Specifically, the paper considers: why and how subgroup findings are important for applied research, the importance of pre-specifying sub- groups before analyses are conducted, the importance of using existing theory and…

This executive summary describes results of the "Reading First Impact Study: Interim Report." The report presents preliminary findings from the Reading First Impact Study, a congressionally mandated evaluation of the federal government initiative to help all children read at or above grade level by the end of third grade. The No Child…

This report presents preliminary findings from the Reading First Impact Study, a congressionally mandated evaluation of the federal government initiative to help all children read at or above grade level by the end of third grade. The No Child Left Behind Act of 2001 (NCLB) established Reading First and mandated its evaluation. This document is…