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This qualitative study explores a cohort professional development experience that brought new teachers together every few weeks from across an urban school district. Observation data were analyzed through Wenger's (1998) Communities of Practice social learning framework. The purpose was to examine how a cohort can be a valuable resource of new teacher support, particularly in areas where novices, who are being prepared largely through alternative routes, start their careers in some of the most challenging teaching assignments. Key theoretical insights resulting from the analysis include (a) the importance of interactivity of the Wenger elements, (b) the centrality of the community component, and (c) the implications of what legitimate peripheral participation looks like for a solely novice community of practice. Implications of these theoretical considerations are discussed and then linked to possibilities for practice and research to supplement current, traditional induction and mentoring practices.

For over a decade, professional learning communities (PLCs) have been touted as an effective way to build upon the knowledge and skills of experienced teachers, yet much of the evidence base is derived from self-reports by practitioners. Although several generations of school reform (the standards movement, No Child Left Behind, and now the Common Core State Standards) have cited improving teacher effectiveness as key to improving student achievement, little change has occurred in the nature of professional development. This article argues that professional development generally, and PLCs in particular, would benefit from the insights gleaned from the extensive literature on teacher expertise that focuses on how well teachers understand the content they teach and how well they understand how students learn that content.