This document summarizes a study on school-based teacher action research. It finds that teacher participation in action research projects provides valuable professional development by helping teachers reflect on their practice, articulate tacit knowledge, and implement changes in their classrooms. Challenges include finding time and navigating expectations about research. Preliminary results show benefits like increased confidence and status for teachers, as well as a more open culture around research in some schools. The author plans to continue data collection and explore models for supporting teacher research.