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.publiccharters.org/files/1554_file_CS_Achievement_Studies_Oct06_Update_1_.doc
This 2006 edition of charter school achievement studies summarizes and evaluates 58 comparative studies of charter school and traditional public school performance. Thirty-three of the studies look at change over time in student or school performance. Of these 33 studies: 16 find that overall gains in charter schools were larger than other public schools; 7 find charter schools' gains higher in certain significant categories of schools; 6 find comparable gains in charter and traditional public schools; and 4 find that charter schools’ overall gains lagged behind. Twenty-five of the studies only look at a snapshot of performance at one or more points in time. Of these 25 studies: 10 show charter schools generally underperforming traditional public schools while the other 15 show comparable, mixed or generally positive results for charter schools.
Date: 2006
Source: National Alliance for Public Charter Schools
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