From the NYTimes editorial:
The charter school movement gained a foothold in American education two decades ago partly by asserting that independently run, publicly financed schools would outperform traditional public schools if they were exempted from onerous regulations. The charter advocates also promised that unlike traditional schools, which were allowed to fail without consequence, charter schools would be rigorously reviewed and shut down when they failed to perform.
With thousands of charter schools now operating in 40 states, and more coming online every day, neither of these promises has been kept. Despite a growing number of studies showing that charter schools are generally no better — and often are worse — than their traditional counterparts, the state and local agencies and organizations that grant the charters have been increasingly hesitant to shut down schools, even those that continue to perform abysmally for years on end.
If the movement is to maintain its credibility, the charter authorizers must shut down failed schools quickly and limit new charters to the most credible applicants, including operators who have a demonstrated record of success.
That is the clear message of continuing analysis from the Center for Research on Education Outcomes at Stanford University, which tracks student performance in 25 states. In 2009, its large-scale study showed that only 17 percent of charter schools provided a better education than traditional schools, and 37 percent actually offered children a worse education.
A study released this week by the center suggests that the standards used by the charter authorizers to judge school performance are terribly weak.