This study focuses on the depth of implementation of a professional development initiative. In one group, the school based leadership team was provided specialized coaching to support and monitor the implementation of the initiative. In the other group, no assistance was provided. Results indicate that the coaching of a school-based leadership team to support and monitor a professional development initiative has significant impact on the depth and rate of implementation. Such mentoring also influences the alignment of the perceptions of the depth of implementation between teachers and the leadership team. (Contains 1 table, 4 figures, and 1 footnote.)