This volume is a unique contribution to thephilosophy of the social sciences, presenting the results of cutting-edge philosopher's research alongside critical discussions by practicing social scientists. The book is motivated by the view that the philosophy of the social sciences cannot ignore the specific scientific practices according to which social scientific work s being conducted, and that it will be valuable only if it evolves in constant interaction with theoretical developments in the social sciences. With its unique format guaranteeing a genuine discussion between philosophers and social scientists, this thought-provoking volume extends the frontiers of the field. It will appeal to all scholars and students interested in the interplay between philosophy and the social sciences.