Policy experts are renewing questions about the role of school culture and leadership in the drive to improve teaching effectiveness in the most-challenging school environments. As states and districts increasingly explore tactics like performance-based pay, incentive programs, and bonuses to attract the best teachers to troubled schools, experts…

How many teachers stay, especially in the schools that need them most? The question has attracted widespread attention as policymakers have recognized that expert teaching is the most important school-related factor in student achievement. Data show that poor and minority students assigned to ineffective teachers lag significantly behind their…