Teacher evaluation reform has been among the most controversial education reforms in recent years. It also is one of the costliest in terms of the time teachers and principals must spend on classroom observations. We conducted a randomized field trial at four sites to evaluate whether substituting teacher-collected videos for in-person…

States, programs, and schools have long focused on the inputs of teacher preparation--the rules for candidates and the preparation programs they attend--because inputs were thought to predict teacher effectiveness, and because they were often the best option available. But in the early 2000s, policymakers began trying to evaluate preparation…

Over the past decade, national initiatives have shifted States' attention to the challenge of turning around low-performing schools. The lack of consistent, dramatic improvements in the lowest-performing schools reflects the severity of the school turnaround challenge, but also suggests the need to continuously evaluate and refine turnaround…