Leadership matters. Principals are the primary drivers of school improvement and the best long-term investment to ensure effective teaching and learning at scale. Principals are central to State efforts to implement new college and career-ready standards, execute teacher evaluation and support systems and turn around low-performing schools. These…

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…