The applicability of paradigm principal-agent in European Union studies have been the focus of political scientists and other specialists at International Relations, mostly in last decade. The main goal here is discuss the main theorists who apply this paradigm to understand how works the European system, as well in perceive which questions emerges from this debate. Between the most researched logics of delegation, there is a great interest in the performance of European Commission, European Parliament and Court of Justice, this last one more incipient. All of them are considered as agents of member states, represented by the European Council. It will be also discussed the theoretical difficulties of this paradigm, especially with regard to its empirical evidence.
Delegation; Europe Union; Institutions; Decision-making
