The Middle-Grades Leadership Development (MLD) Project was designed to develop principal leaders and leadership teams who create high-performing middle-grades schools. Designed by the National Forum to Accelerate Middle-Grades Reform, the four-year project was funded from 2013 to 2017 by a U.S. Department of Education Investing in Innovation (i3)…

Successful implementation of evidence-based educational practices at scale is of great importance but has presented significant challenges. In this article, the authors address the following questions: How does the level of on-site technical assistance affect student outcomes? Do teachers' fidelity of treatment implementation and their perceptions…