This 2007 volume is intended to help readers understand the relationship between international law and international relations (IL/IR). As a testament to this dynamic area of inquiry, new research on IL/IR is now being published in a growing list of traditional law reviews and disciplinary journals. The excerpted articles in this volume, all of which were first published in International Organization, represent some of the most important research since serious social science scholarship began in this area more than twenty five years ago. They are important milestones toward making IL/IR a central concern of scholarly research in international affairs. The contributions cover some of the main topics of international affairs to provide readers with a range of theoretical perspectives, concepts, and heuristics that can be used to analyze the relationship between international law and international relations.

International institutions vary widely in terms of key institutional features such as membership, scope, and flexibility. In this 2004 book, Barbara Koremenos, Charles Lipson, and Duncan Snidal argue that this is so because international actors are goal-seeking agents who make specific institutional design choices to solve the particular cooperation problems they face in different issue-areas. Using a Rational Design approach, they explore five features of institutions - membership, scope, centralization, control, and flexibility - and explain their variation in terms of four independent variables that characterize different cooperation problems: distribution, number of actors, enforcement, and uncertainty. The contributors to the volume then evaluate a set of conjectures in specific issue areas ranging from security organizations to trade structures to rules of war to international aviation. Alexander Wendt appraises the entire Rational Design model of evaluating international organizations and the authors respond in a conclusion that sets forth both the advantages and disadvantages of such an approach.