Could adoption of judicious policies and practices in the charter sector create a million more excellent opportunities for students over the next decade? This report, prepared by Public Impact for the National Association of Charter School Authorizers and the Charter School Growth Fund, makes recommendations that legislators, authorizers, and state education agencies can use to build a policy environment that will substantially increase the prevalence and impact of high-quality charter schools. The recommendations support four strategies to promote quality in the sector: differentiating charter operators based on performance, building system capacity to cultivate and support high-performing schools and networks, facilitating replication of high performers and accelerating closure of low performers.