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.edexcellence.net/doc/Gau%20Charter%20AuthorizerV2%20(2).pdf
Using data from a sample of 184 entities that together authorizes nearly one-half of the nation's charter schools, the study describes seven types of authorizers. The author judges how well the authorizers practice “five elements of successful authorizing:” data-driven decision-making; sound working relations; skilled personnel; adequate resources and autonomy; community and parent input. Authorizers are growing more selective when deciding whether to allow charter schools to open, lowering the national approval rate from 70 percent in 2003 to approximately 50 percent in 2006. An estimated 75 percent of non-renewals were due to poor academic performance. Thirty-one percent of authorizers were found to be aggressive about both quality and compliance, while almost half practice limited oversight of their schools.
Date: 2006
Source: Thomas B. Fordham Foundation
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