Using Lave and Wenger's framework of legitimate peripheral participation in communities of practice, this case study explores the experiences of three novice teachers engaged with more experienced teachers in a teacher study group during their first year of teaching. The study illustrates how, over time, the novices moved from more peripheral to more central participation as revealed through changes in their talk and feelings about participating. The study highlights the importance of legitimacy and peripherality provided by the more experienced teachers and identifies the ways in which the facilitator scaffolded and mediated the novices' participation and learning. (Contains 2 figures.)