Abstract
Teacher leadership has been found to be positively associated with student achievement, and the dimensions of teacher leadership positively associated with teacher leadership have been identified. However, mechanisms to improve teacher leadership and the effects of these mechanisms are rarely studied. In this article, we report the efforts to develop teacher leadership in a multi-year, large-scale project titled, “HighImpact Leadership for School Renewal”, and the effects of these efforts. Repeated measure analysis was conducted to assess the project’s effect on teacher leadership using validated and published instruments. The results indicated that the project had large effects on enhancing teacher leadership, with Cohen’s d effect size ranging from 0.85 to 1.16 for scales of Orientation to School Renewal and from 0.87 to 1.13 for scales of Learning-Centered School Leadership. Implications for school renewal are discussed.