Fidelity of implementation (FOI) is the extent to which delivery of an intervention adheres to the original intent of the program designer. FOI in educational studies is hindered by the lack of a universally agreed upon definition or set of criteria for measurement. With the increasing need for justification of reliability and validity of…

The "Common Core State Standards/English Language Arts" include the ability to become increasingly more capable with complex text over the school career, redirecting attention to the measurement of text complexity. While suggesting multiple criteria, the Standards offer a single measure of text complexity--Lexiles. Additional…

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…