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Formal teacher leader programs that develop, position, and reward teachers to work with peers to improve instruction are a growing reform effort in the United States, yet there are few published studies of their efficacy. In this paper, we examine the impacts of one district's teacher leadership program on students' annual state test performance. The program placed full-time instructional coaches and partly released English language arts (ELA) and mathematics content specialists in each of 11 district schools. To assess the program's impact, we examined five years of student-level state test data; two years before the adoption of the intervention and three years afterwards. Using an interrupted time series design, we examined trends in performance before and after the adoption of the intervention. Overall, there were no significant effects in ELA, and a small negative effect in mathematics. By contrast, in the stable sub-sample of students who were in the district for the five years examined in the study, there was a large significant positive effect in mathematics and large but non-significant positive effect in ELA. We conclude with a discussion the implications of these findings for research and policy.

This study focuses on the impacts of programs designed to develop and support teacher leaders to improve instruction in their schools. Using surveys of teachers in 45 schools in four districts and interview data, we found that the frequency of teachers' work with a teacher leader on professional growth, instructional planning, and observations/feedback were all significantly related to teacher leader influence. Higher levels of teacher leader influence were also associated with teacher reports of change in practice. The study provides evidence of what types of teacher leader activity are perceived as influential by teachers and how teacher leadership influences instruction.

Some recent district-level teacher leadership programs have incorporated both instructional coaching and formal evaluations into teacher leaders' (TLs) responsibilities, which research suggests could challenge the relational dynamics necessary for effective coaching. Using a sensemaking lens, we conducted a qualitative case study of one district's effort to integrate coaching and formal evaluation in their teacher leadership policy. We conducted a total of 26 semistructured interviews with district administrators and school leaders, TLs, and teachers in two schools, and seven observations of teacher leadership activities. We coded interview transcripts and field notes deductively and inductively. We found that when granted autonomy, principals drew on varied sources for making sense of and enacting this policy, and the messages they conveyed through school leadership norms deeply influenced how teachers and TLs enacted and experienced the integration. The integrated district policy in and of itself did not hinder relationships between teachers and TLs; rather, what mattered most for teachers was the extent to which they perceived their TLs as part of a larger system of support or accountability. This study suggests that the school norms that school leaders put into place when enacting teacher leadership policies deeply influence teachers' perceived relational dynamics with TLs. Teacher leaders have a unique role in implementation that is shaped by school-level norms and conceptions of effective leadership and coaching.