State testing programs today are more extensive than ever, and their results are required to serve more purposes and high-stakes decisions than one might have imagined. Assessment results are used to hold schools, districts, and states accountable for student performance and to help guide a multitude of important decisions. This report describes…

This report presents results from a new quantitative synthesis of research on the effectiveness and validity of test accommodations for English language learners (ELLs) taking large-scale assessments. In 2006, the Center on Instruction published a review of the literature on test accommodations for ELLs titled "Practical Guidelines for the…

This paper examines how controlling statistically for baseline covariates (especially pretests) improves the precision of studies that randomize schools to measure the impacts of educational interventions on student achievement. Part I of the paper introduces the concepts, issues, and options involved. Parts II and III present empirical findings…

When it comes to teacher preparation, the support provided to new teachers, and ongoing professional development for working teachers, Grades K-12 and the field of early care and education (ECE) are two very different worlds. While both worlds assume that teachers' classroom skills and behavior can be influenced at multiple points in time (through…

This paper aims to broaden the discussion about effective teacher preparation by exploring three hypotheses designed to expand the early care and education (ECE) research agenda: (1) Both the content and the method of delivery of an educational degree influence teacher practices; (2) Teachers' ability to apply knowledge and skills effectively…