A better, bigger, broader charter school sector—that’s what the U.S. needs to meet students’ needs in a competitive and interconnected world, this report says. Twenty-five years after the first charter law was enacted in Minnesota, the public charter school sector has helped spark significant public education improvements, particularly for urban students and students of color. But the U.S. lags behind other developed countries in student achievement, about 1 million students are on charter school waiting lists nationwide, and many student groups are still underserved by all public schools, traditional and charter. This report, co-authored by The Mind Trust and Public Impact, calls on all involved in charter schools to make the sector better, broader, and bigger in order to expand its reach and meet the students’ needs—which will require innovation that breaks the mold of most schools today. The report recommends various steps charter school operators, policymakers, city-based education organizations, and philanthropic funders may take to spur more innovation in the sector.