“…As noted earlier, analyses have demonstrated very high rates of student mobility in school voucher programs in Milwaukee (Carlson, Cowen, & Fleming, 2013;Cowen et al, 2012), Washington, D.C. (Wolf et al, 2010), and New York City (Howell, 2004), as well as charter schools in several states including Florida, Texas, and Idaho (Ballou et al, 2006;Cowen & Winters, 2013;Hanushek et al, 2007). Such findings raise the possibility that increased levels of student mobility-particularly for disadvantaged populations-represent an unintended consequence of school choice policies, a possibility that is potentially troublesome given the large body of work demonstrating student mobility to have a negative effect on academic outcomes, specifically student achievement (Alexander, Entwisle, & Dauber, 1996;Engberg, Gill, Zamarro, & Zimmer, 2012;Hanushek, Kain, & Rivkin, 2004;Ingersoll, Scamman, & Eckerling, 1989;Kerbow, Azcoitia, & Buell, 2003;Lash & Kirkpatrick, 1990, 1994Rumberger et al, 1999;South, Haynie, & Bose, 2007;Temple & Reynolds, 1999;Xu, Hannaway, & D'Souza, 2009;Zimmer & Buddin, 2009). In the light of such possibilities, the results suggest that policymakers should concentrate on not only using school choice programs to provide disadvantaged populations with access to high-quality schools but also to design such programs in a manner that maximizes the stability and continuity of that access.…”