Ingersoll, Richard2023-05-222023-05-222008-01-012008-02-14https://repository.upenn.edu/handle/20.500.14332/34896The failure to ensure that all of our nation's classrooms are staffed with qualified teachers is one of the most widely discussed, but least understood, problems facing our elementary and secondary schools. In recent years, dozens of reports and reform initiatives have sought to solve this problem. Unfortunately, the array of recent efforts do not address some of its key causes.Policy and AdministrationOther