The gold standard in making causal inference on program effects is a randomized trial. Most randomization designs in education randomize classrooms or schools rather than individual students. Such "clustered randomization" designs have one principal drawback: They tend to have limited statistical power or precision. This study aims to…

School and government officials, system administrators and other policymakers offer a variety of reasons for engaging in high stakes testing: to monitor student performance, to measure teacher and/or school effectiveness, to ensure accountability, etc. Some of these reasons are good; others not. But the best reason--one that is never offered,…