However, exits, improvement of existing charter schools, and expansion of higher - performing charter management organizations increased charter effectiveness relative to traditional public schools. (caldercenter.org)
Of the 13 strongest charter laws, 12 were passed between 1991 and 1999, and it is these 12 states alone that account for over 56 % of existing charter schools. (edreform.com)
Please note, it does not satisfy the legal requirements for existing charter school board members. (gacharters.org)