This groundbreaking study maps out and analyzes the development of a global intergovernmental (IGO) institutional architecture in the post World War II era.

Systematically traces similarities and differences between the institutional architecture of the Cold War and post-Cold War eras
Examines the range of reasons why states join IGOs, identifies patterns of participation within these organizations, and examines the effects of membership on states
Considers the impact of the EU on other regional organizations and developments outside Europe
Provides a strong contribution to the study of international organization and IGO development combining both quantitative and qualitative methodologies