The Center for Education Reform (1.1MB PDF):

In their recent report analyzing the politics of charter school laws, Christiana Stoddard and Sean P. Corcoran of Education Nextrelied upon The Center for Education Reform’s (CER) Charter School Law Rankings and Profiles to study the success of the charter school movement.
As they recognized, the strength of a law could impact the way in which healthy charter schools grow and how they serve students. Having laws with certain components is critical.
CER welcomes this scrutiny and the dozens of other research reports, which utilize its rankings as a guide for assessing policy. We also recognize that not all researchers find the work we have done for ten years on law strength compelling. Researchers at the University of Colorado at Boulder find our data and conclusions a bit hard to swallow. They argue that what CER considers strong components of a law – flexibility, autonomy, equitable funding – are actually weaknesses. Despite their claims that the weakest are actually the strongest, the data do not lie. States with strong laws by our standards (and those shared almost universally by the research community whether friend or foe) create strong schools.
Put another way, strong laws matter.