Policymakers know that improving teaching in our schools requires a systemic look at many policies related to educator effectiveness. For example, teacher preparation programs need to be dramatically improved and strengthened, but without accompanying reform in compensation, even highly effective and innovative schools of education are unlikely to…

Teachers have the greatest school-based effect on the achievement of any child in their classrooms, but highly effective principals can positively affect the achievement of every student in their schools. The difference between a highly effective principal and an average one is equal to two-to-seven months of extra learning per year for each child…