Charter schools operate public elementary, middle or secondary schools that are relatively autonomous schools of choice. They operate under a charter, or contract, issued by a public entity such as a local school district or State Public Charter School Authority. Individual states determine in their charter school legislation which rules must be adhered to, which rules may be waived, and which procedures must be followed to obtain a charter. In return for their autonomy, charter schools are held accountable for student performance: Quoting the Center on Reinventing Public Education "Every charter school statute embodies a legislature's intent to give school organizers a relatively free hand in managing individual schools in return for accepting increased responsibility for student performance. This is the "basic bargain" of charter school legislation: autonomy for accountability." If the goals of the school set forth in the charter are not reached, the school’s charter may be revoked or not renewed.