The cornerstone of these practices is NACSA’s Principles & Standards for Quality Charter School Authorizing, first published in 2004 and regularly updated as the field evolves. This is the foundational text for authorizers, who are charged with promoting school quality through flexibility over inputs and accountability for outcomes. Increasingly, Principles & Standards (P&S) has also become a guidepost for education advocates and lawmakers who craft and revise state charter school laws and policies.