Twelve studies find that overall gains in charter schools are larger than other public schools; four find charter schools’ gains higher in certain significant categories of schools; six find comparable gains; and, four find that charter schools’ overall gains lagged behind traditional schools.
Source: Charter School Achievement: What We Know, July 2005 Update
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Download: 
http://www.rand.org/pubs/monograph_reports/2007/RAND_MR1118-1.updatedfindings.pdf
This report summarizes new empirical evidence on the achievement impacts of charter schools and voucher programs nationally. The authors find that well-designed voucher and charter programs show promising gains, while few show any evidence of substantial harms to student achievement. They note the important impact policy design has on choice programs: not all charter laws and voucher programs are alike or created equally, and different programs will produce different effects. They call for additional research to help clarify the specific beneficial policy components and to assess a more complete understanding of student outcomes.
Date: 2007
Source: RAND Corporation
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