This article reports on two professional development programs for mathematics teachers and their effects on student achievement. The projects' design and their implementation within a larger municipality in Sweden, working together with over 90 teachers and 5000 students in elementary school, are described by using a set of core critical features…

Background: Cluster-randomized experiments that assign intact groups such as schools or school districts to treatment conditions are increasingly common in educational research. Such experiments are inherently multilevel designs whose sensitivity (statistical power and precision of estimates) depends on the variance decomposition across levels.…

This technical report presents an overview of a reading assessment used by a large school district in the Pacific Northwest. It provides sufficient background information to enable those unfamiliar with the assessment to understand the various subtests that comprise it as well as its development and application in the district for making…