Under what conditions does the internal cohesiveness of the European Union determine its external effectiveness on the world stage? This book asks this question, investigating the frequent political assumption that the more cohesive the EU presents itself to the world, the more effective it is in achieving its goals. Contributions to this book explore this theory from a range of perspectives, from trade to foreign policy, and highlight complex patterns between internal cohesiveness and external effectiveness. These are simplified into three possible configurations: internal cohesiveness...