Charter schools turn 21 this year. In that time, these privately run, publicly funded schools have spread to 41 states and enrolled more than 2 million students.
But one key question lingers: Do kids in charter schools learn more than kids in traditional public schools?
There have been lots of skirmishes over charter school data over the years. But few have created as big a ruckus as the of charter schools released recently by Stanford University's Center for Research on Education Outcomes, or CREDO.
Like previous studies, the one from CREDO concluded that kids in most charter schools are doing worse or no better than students in traditional public schools. About a third, though, are doing better. And that's a big jump from four years ago. The gains among blacks, Latinos and kids whose first language is not English have been impressive and surprising, says CREDO Director Margaret Raymond.