Based on the outcomes of a workshop convened by the U.S. National Committee for Psychological Science and informed by a survey of social scientists who have led cross-national projects, this National Science Foundation-funded report addresses the multiple benefits of research extending across national boundaries and describes factors common among successful collaborations. Workshop participants identified the obstacles frequently encountered and suggested ways of dealing with these challenges to enhance international collaborative research in the behavioral and social sciences. Several dimensions of collaborative processes, such as research planning, methodological issues, organizational concerns, varied training approaches, and funding needs receive critical attention in this book.