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…

The state of Ohio wants to take charter schools to a whole new level: colleges of education. The state department of education is seeking to establish teacher-preparation schools that are free from state regulations so long as they produce high-quality teachers--a variation on the concept that has led to the creation of more than 3,000 K-12…