States are in various stages of reforming how they evaluate their educators, all striving for a new system that can assess a range of abilities and practices over long periods of time and capture the full nature of an educator's performance. The strongest systems look at teaching in a more comprehensive way than evaluations have done in the past,…

One of the most important things school systems can do to promote student achievement is to ensure that all students have effective teachers. Effective teachers may be particularly important for the most disadvantaged students. The U.S. Department of Education commissioned the American Institutes for Research (AIR) to create this report as a…