The Center for Reinventing Public Education (CRPE) conducted a multiyear, multimethod effort to learn how school districts, charter schools, and regional partners can support the successful implementation, expansion, and sustainability of personalized learning (PL) in schools. The vision for PL is to tailor instruction to individual students' strengths, needs, and personal interests--often integrating technology--to boost student outcomes. CRPE researchers used a combination of field studies, surveys, and secondary data analysis to explore how schools, districts, and partner organizations help to seed and grow PL, and what the results were. Key questions for the project included: What do principals, teachers, and system leaders need to know and be able to do to successfully support, implement, and scale up PL; What policies and practices--at the classroom, school, district, partnership, and state levels--offered important supports (and barriers) for successfully implementing and scaling up PL; and What were the early results for teachers and students?