In this paper we consider the challenges involved in evaluating teacher preparation programs when controlling for school contextual bias. Including school fixed effects in the achievement models used to estimate preparation program effects controls for school environment by relying on differences among student outcomes within the same schools to…

The utility of value-added estimates of teachers' effects on student test scores depends on whether they can distinguish between high- and low-productivity teachers and predict future teacher performance. This article studies the year-to-year variability in value-added measures for elementary and middle school mathematics teachers from five large…

This article develops a model for longitudinal student achievement data designed to estimate heterogeneity in teacher effects across students of different achievement levels. The model specifies interactions between teacher effects and students' predicted scores on a test, estimating both average effects of individual teachers and interaction…

Value-added modeling (VAM) to estimate school and teacher effects is currently of considerable interest to researchers and policymakers. Recent reports suggest that VAM demonstrates the importance of teachers as a source of variance in student outcomes. Policymakers see VAM as a possible component of education reform through improved teacher…

Value-added models of student achievement have received widespread attention in light of the current test-based accountability movement. These models use longitudinal growth modeling techniques to identify effective schools or teachers based upon the results of changes in student achievement test scores. Given their increasing popularity, this…

Discusses the quality of school-level data collected as part of state accountability systems, including the reliability and validity of school-level test scores as a measure of the value added by schools to student learning, outlining ways that these data can be usefully analyzed; illustrating challenges inherent in doing so; and discussing…

This monograph presents the findings of a multiyear study of the effectiveness of reform-oriented mathematics and science instruction. It builds on an earlier RAND study, called the Mosaic project, which found "a weak but positive relationship" between reform practices and student achievement (see Klein, Hamilton, McCaffrey, Stecher,…