This volume ws the winner of The International Studies Association Theory Section Book Award 2013, presented by the International Studies Association and The Yale H. Ferguson Award 2012, presented by International Studies Association-Northeast. There are many different scientifically valid ways to produce knowledge. The field of International Relations should pay closer attention to these methodological differences, and to their implications for concrete research on world politics. The Conduct of Inquiry in International Relations provides an introduction to the philosophy of science issues and their