This paper presents an updated WWC (What Works Clearinghouse) Quick Review of the Report "The Milwaukee Parental Choice Program Longitudinal Educational Growth Study Third Year Report". The study examined whether students in Milwaukee who use a voucher to attend private school have greater mathematics and reading achievement than students who attend public schools. The research described in this report meets WWC evidence standards with reservations. [The following study is the focus of this "Quick Review": Witte, J. F., Cowen, J. M., Fleming, D. J., Wolf, P. J., Condon, M. R., & Lucas-McLean, J. (2010). "The MPCP Longitudinal Educational Growth Study third year report" (SCDP Milwaukee Evaluation Report #15). This is an updated version of a quick review released in September 2010. To access this review, see ED511699.]