Charter schools–public schools of choice that are operated autonomously, outside the direct control of local school districts–have become more prevalent over the past two decades. There is no consensus about whether, on average, charter schools are doing better or worse than conventional public schools at promoting the achievement of their students. Nonetheless, one research finding is clear: Effects vary widely among different charter schools. Many educators, policymakers, and funders are interested in ways to identify and replicate successful charter schools and help other public schools adopt effective charter school practices.
Charter-school management organizations (CMOs), which establish and operate multiple charter schools, represent one prominent attempt to bring high performance to scale. Many CMOs were created in order to replicate educational approaches that appeared to be effective, particularly among disadvantaged students. Attracting substantial philanthropic support, CMO schools have grown rapidly from encompassing about 6 percent of all charter schools in 2000 to about 17 percent of a much larger number of charter schools by 2009 (Miron 2010). Some of these organizations have received laudatory attention through anecdotal reports of dramatic achievement results.
Andrew Rotherham comments on the study.