Although collaborative teacher education programs have grown in number over the past two decades, we still do not understand the ways in which these programs, or the practices in those programs, improve the preparation of inclusive teachers. At a time when teacher education's viability is being questioned, it is problematic that little information exists about the validity and impact of collaborative programs. To justify collaborative teacher education programs and improve the science of teacher education more broadly, the authors propose a framework for conducting research on collaborative teacher education--one that can be used to analyze current research and inform future efforts. In this article, the authors build a framework for studying collaborative teacher education, emphasizing linkages among theory, innovation, and outcomes. The authors then analyze the collaborative teacher education literature according to this conceptual framework, drawing conclusions about the current state of collaborative teacher education research and making recommendations for the future.