Ingersoll, Richard2023-05-222023-05-222004-01-012007-10-24https://repository.upenn.edu/handle/20.500.14332/34888The failure to ensure that the nation's classrooms are all staffed with qualified schoolteachers is one of the most important problems in contemporary American education. Over the past two decades, dozens of reports and national commissions have focused attention on this problem, and, in turn, numerous reforms have been initiated to upgrade the quality and quantity of the teaching force.Policy and AdministrationArticle