Abstract: This reference guide provides some details about each of the nation's 41 charter school laws and rates their strengths and weaknesses. Six states receive a letter "A" and two received an "F." For example, with 509 charter schools operating in Arizona in Spring 2005, the state is applauded for its flexibility and multiple authorizers. It receives the label as the state with the nation's strongest charter school law. In addition to current rankings, the document predicts the future health of the charter school movement in each state.