How many students repeat a grade each year? How do retention rates vary across states and over time? Despite extensive research on the predictors and consequences of grade retention, there is no systematic way to quantify state-level retention rates; even national estimates rely on imperfect proxy measures. We present a conceptually simple…

This article describes some of the conceptual and methodological issues that arise when researchers use teacher logs to measure classroom instruction. Data and examples come from the Study of Instructional Improvement, which used teacher logs to study patterns of literacy instruction in schools implementing three comprehensive school reforms. Over…