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The general purpose of this study is to assess the effectiveness of Milwaukee’s independent charter schools in promoting student achievement growth. Independent charter schools are authorized by non-school district entities and are considered"independent" because they are not a part of the Milwaukee Public School District (MPS). Throughout the course of this report we will estimate three-year achievement growth for independent charter school students who were in grades 3 through 8 at baseline (2006-07). We will examine four years of scores in reading and math on the Wisconsin Knowledge and Concepts Examination (WKCE). Specifically, the report presents the results of an analysis comparing achievement gains of independent charter students to the achievement gains of a group of matched comparison students attending MPS. Our next report, to be released in spring 2012, will examine four-year achievement gains.