In 2011, the Bill & Melinda Gates Foundation extended grants to three educational organizations working to develop or enhance competency-based approaches in large, urbanized school systems. The grant initiative, called Project Mastery, funded the development of technology-enhanced tools, including curriculum materials and online learning management systems, as well as the implementation of these tools in secondary school classrooms. The Project Mastery grants were awarded to three organizations: Adams County District 50, the Asia Society, and the School District of Philadelphia. The Foundation asked RAND to evaluate these efforts in terms of implementation, students' experiences, and student performance. The evaluation team collected site-visit data during the two grant years--academic years 2011-2012 and 2012-2013--and analyzed data during the 2013-2014 year. This brief highlights the key findings from that evaluation. [For the full report, see ED561112.]