The purpose of this study was to evaluate the National Institute for School Leadership's (NISL's) Executive Development Program (EDP) and paired leadership coaching as implemented in three states, with funding from the U.S. Department of Education's Investing in Innovation (i3) grant program. NISL's Executive Development Program (EDP) is a year-long professional development program that has served thousands of principals in 23 states since 2014. The study was a randomized control trial study spanning 332 schools and 118 school districts. It evaluated the effects of the offer of and of participation in the EDP and coaching. Take up rates of the program were relatively low, and the study found no significant effects of the EDP and coaching on student achievement in English language arts or mathematics, on student attendance rates, or on student grade progression rates within three years of the start of the program. There were, however, effects of participation in the EDP and coaching in two areas of leadership practice as reported by principals on surveys conducted more than two years after the start of the intervention. We hypothesize that local buy-in and capacity to fully participate in the intensive professional development program most likely influenced the degree to which the intervention was successful. [Criterion Education sponsored this report, with funding from NISL through the i3 grant from the U.S. Department of Education. For the first report of this series, "Putting Professional Learning to Work: What Principals Do with Their Executive Development Program Learning," see ED606171.]