The public debate about the success and expansion of charter schools often seems to gravitate toward a tiny handful of empirical studies, when there is, in fact, a relatively well-developed literature focused on whether these schools generate larger testing gains among their students relative to their counterparts in comparable regular public…

In the last quarter-century and especially the last decade, testing and accountability have come to dominate education policy at the state and national levels. The common concern about the effects of such testing is that it reshapes teaching in the classroom. But such claims do not look at the evidence of deeper classroom structures (the mix of…