According to national survey data, access to and participation in professional development varies widely across states, and the quality of professional development across most states is far from meeting research-based definitions of effective professional development, with a few pockets of excellence in some states. In this study, "Teacher…

This article argues that a principal's actions can create site-based conditions that can grow a staff's capacity to improve instruction, depending on how a principal conceives of, organizes, and structures learning opportunities for teachers. The article analyzes the leadership of one principal as an example of how leaders can develop…