In recent years, debates over school reform have increasingly focused on the role of teacher unions in the changing landscape of American K-12 education. On one hand, critics argue that these unions, using their powerful grip on education politics and policy to great effect, bear primary responsibility for blocking states' efforts to put into…

This article presents an example of teacher professional development based on a perspective of situated learning and implemented on a large scale. We consider teacher professional development from three perspectives. First, teacher professional development is a key factor in improving classroom instruction. Second, teacher professional development…