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.incschools.org/2004-2005%20Performance%20Report%20FINAL.pdf
This evaluation finds that Chicago's charter schools performed better than neighboring traditional public schools in reading, science and math in 2004-05. Charter schools and campuses out-performed their relative neighborhood schools on 86 percent of the relative student performance measures. All 14 charter schools reporting on the ISAT composite scores had a higher percentage of students meeting and exceeding Illinois Learning Standards than their comparison neighborhood schools. All six charter high schools reporting on PSAE composite scores had a higher percentage of students meeting or exceeding Illinois Learning Standards than their comparison neighborhood schools. In addition, students attending the eight charter public high schools were more likely to graduate on time than those attending neighboring traditional public schools (75% v. 54%).
Date: 2006
Source: Chicago Public Schools, Illinois Network of Charter Schools
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