Regional Actors in Multilateral Negotiations is one of the first studies of the conditions under which regional actors influence international negotiations and their outcomes. The methodologically sophisticated comparison of more than 60 regional organizations provides important insights on the regionalization of world politics and makes a major contribution to the emerging field of comparative regionalism.This timely book breaks new ground in the study of regional and global politics. The authors successfully combine theory and rigour with innovation and contextual sensitivity in order to provide a nuanced and fascinating account of the regionalisation of multilateral negotiations. In doing so, they lead the way into the next generation of scholarly work on comparative regionalism as well as global governance.Regional Actors in Multilateral Negotiations is an insightful and thought-provoking analysis of an important and understudied phenomenon, the participation of regional organizations in international negotiations. Panke, Lang, and Wiedemann generate a series of astute generalizations about the conditions and effects of regional participation which they systematically test using original data. This is a significant and convincing contribution to our understanding of international politics.This book sheds light on the role of regional actors in multilateral negotiations across a series of international organizations.Since the end of WWII, not only the number of international regimes and organizations, but also the number of regional organisations and groups increased considerably. Today, states are often members of regional and international organisations at the same time and cover similar policies in both. This contributes to a regionalization of international relations since not only states, but also regional actors are active in international negotiations. This book provides a comprehensive analysis of how active and how influential regional actors are in todalÓ$