This report examines the ongoing effort to revamp teacher evaluations. After collecting and synthesizing data from 17 states and the District of Columbia, it provides five major lessons for policymakers. New evaluation systems are just one part of sweeping changes in American schools. Because the number and extent of these changes are daunting,…

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…