This paper summarizes key insights that RAND Education has developed about the evaluation of efforts targeting principals through our multiyear effort to evaluate the New Leaders program. These insights have emerged through the work of a large team, not all of whom are reflected in the list of authors for this paper. In particular, Paco Martorell, who leads the analysis of student achievement data for this evaluation, is the source of many of the key points raised here. We also acknowledge the contributions of Paul Heaton and Mirka Vuollo, key members of the evaluation team. New Leaders staff Gina Ikemoto, Brenda Neuman-Sheldon, Ben Fenton, Lori Taliafero, and Jackie Gran provided useful feedback on the overall development of this paper, as well as on earlier drafts. We are also grateful to Cathy Stasz of RAND, who provided helpful comments on an early draft, and to Kerri Briggs at the George W Bush Institute and RAND colleague John Engberg, who reviewed the report and provided constructive suggestions for improvement.
Donna White helped to compile and format the final document. Nora Spiering edited the final copy. The authors take full responsibility for any errors.