These policies were soon followed by objections from parents to programs that attempted to go beyond forbidding discrimination. Supporters of busing argued that these measures were necessary to compensate African Americans and other minorities for generations of segregation. Charter schools are publicly-funded, tuition-free schools, but they differ from traditional public schools in key ways. Comparing charter schools to public schools requires weighing a few different considerations. First, charters have more flexibility. Rather than being part of a public school district, which dictates curriculum and standards in all schools, charters operate autonomously through individual agreements, or charters, with state or local governments that dictate rules and performance standards.