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.ctags.org/WMU%202005%20CT%20Chartter%20school%20report.pdf
This report, commissioned by the Connecticut Coalition for Achievement Now (ConnCAN), focuses on performance gains made by charter schools on standardized tests relative to gains made by traditional public schools. The evaluation compared the performance of students at eight state charter elementary and middle schools on the Connecticut Mastery Tests (CMT) in reading, writing, and math to students in nearby traditional public schools. It tracked groups of students in fourth, sixth, and eighth grade over time and measured changes in test scores, to gauge the value added by the school. Researchers found that charter schools made much larger gains in three out of four groups, outperforming the traditional public schools by at least 10 points on all three tests. The results in this report are largely in line with a report from 2002 that showed the state's charter school students gaining more on state assessment tests.
Date: 2005
Source: Western Michigan University, Evaluation Center
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