Designing professional development that effectively supports teachers in learning new and often challenging practices remains a dilemma for teacher educators. Within the context of current reform efforts in science education, such as the Next Generation Science Standards, teacher educators are faced with managing the dilemma of how to support a large number of teachers in learning new practices while also considering factors such as time, cost, and effectiveness. Implementation of educative, reform-aligned curricula is one way to reach many teachers at once. However, one question is whether large-scale curriculum implementation can effectively support teachers in learning and sustaining new teaching practices. To address this dilemma, this study used a comparative, multiple case study design to investigate how secondary science teachers engaged in sensemaking about implementation of an innovative science curriculum across the settings of professional development and classroom enactment. In using the concept of sensemaking from organizational theory, I focused specifically on how teachers' roles in social organizations influenced their decisions to implement the curriculum in particular ways, with differing outcomes for their own learning and students' engagement in three-dimensional learning. My research questions explored: (1) patterns in teachers' occasions of sensemaking, including critical noticing of interactions among themselves, the curriculum, and their students; (2) how teachers' social commitments to different communities influenced their sensemaking; and, (3) how sustained sensemaking over time could facilitate teacher learning of rigorous and responsive science teaching practices. In privileging teachers' experiences in the classroom using the curriculum with their students, I used data generated primarily from teacher interviews with their case study coaches about implementation over the course of one school year. Secondary sources of data included artifacts such as teacher-modified curriculum materials, classroom observation notes, and video-recordings of classroom instruction and professional development sessions. Data analysis involved descriptive coding of the interview transcripts and searching for linguistic markers related to components of an occasions of sensemaking. Findings show that teachers engaged in sensemaking about curriculum implementation in multiple and different ways that were either productive or unproductive for their learning of rigorous and responsive science teaching practices. Teachers that had productive outcomes for teacher learning were engaged in sustained sensemaking that involved critical noticing of interactions between the curriculum, themselves, and their students, with the goal of bridging the gap between what the curriculum offered and what their students could do. In contrast, teachers that had unproductive outcomes for teacher learning were engaged in sensemaking that often involved critical noticing of only one aspect and were motivated by local obligations. Four themes emerged: sustained sensemaking over time, the influence of school communities, teacher learning of content, and the influence of teachers' beliefs. Using these findings and themes, I present a model for teacher sensemaking within the context of long-term professional development around implementation of an innovative curriculum, with a mechanism for how teacher learning could occur over time. Implications for science teacher professional development and learning and directions for future research are offered.
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