This extensive evaluation of KIPP charter schools, conducted by Mathematica, will impress even the staunchest KIPP skeptics. The study employed two study designs: The researchers compared the cohorts of forty-one KIPP middle schools (more than half of the total KIPP schools) to students in local non-KIPP schools. They also compared KIPP lottery winners in thirteen oversubscribed schools to non-winners. The upshot? Over a three- to four-year span, KIPP students achieved between eight and fourteen months of additional learning growth compared to their non-KIPP-attending peers. These findings hold across all four core subjects for both state tests and a nationally normed, low-stakes exam (meant to test higher-order thinking skills). What’s more, the researchers included students who left their KIPP schools prior to eighth grade, making these effects a valid measure of anyone who has ever enrolled in these middle schools. But while the academic gains of KIPPsters are unimpeachable, the schools’ affects on student attitudes may not be. Apparently, KIPP increases students’ likelihood of arguing, lying to their parents, and losing their temper, according to student surveys—though one has to wonder if KIPP students are simply more likely than non-KIPPsters to own up to such behaviors.

SOURCE: Christina Clark Tuttle, et al., KIPP Middle Schools: Impacts on Achievement and Other Outcomes (Washington, D.C.: Mathematica Policy Research, February 2013).

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