Evaluations of educational programs or interventions are typically conducted in nonrandomly selected samples of schools or districts. Recent research has shown that nonrandom site selection can yield biased impact estimates. To estimate the external validity bias from nonrandom site selection, we combine lists of school districts that were…

In this report I share the results of a document-based, comparative case study aimed at increasing our understanding about the potential utility of state kindergarten entry assessments (KEAs) to provide evidence of English learner (EL) kindergartners' knowledge and skills and, in turn, inform kindergarten teachers' instruction. Using a sample of 9…

Validity evidence based on test content is of essential importance in educational testing. One source for such evidence is an alignment study, which helps evaluate the congruence between tested objectives and those specified in the curriculum. However, the results of an alignment study do not always sufficiently capture the degree to which a test…

In this article, we explain how overly prescriptive, rigid state statutory and regulatory policy frameworks regarding teacher evaluation, tenure and employment decisions outstrip the statistical reliability and validity of proposed measures of teaching effectiveness. We begin with a discussion of the emergence of highly prescriptive state…

This report highlights 10 of the most advanced and talked-about teacher evaluation systems nationally: Delaware; Rhode Island; Tennessee; Hillsborough County, Florida; Houston, Texas; New Haven, Connecticut; Pittsburgh, Pennsylvania; Washington, DC (referred to throughout just as Washington); Achievement First (a charter management organization,…