This book examines the coherence of EU external representation at the UN for the period of 1993-2012. It theorizes EU representation into a principal-agent model and adopts a nested analysis to detect the coherence variation in EU representation over time. At the UNGA, EU representation is quantitatively measured in terms of EU voting cohesion. At the UNSC, descriptive statistics are analyzed to capture the voting patterns of the EUMS sitting on the council. Both horizontal and vertical coherenc