This book, coordinated and supervised by Prof. Vincenzo Salvatore, is part of the output of the workshop organized by the Università dell’Insubria in Varese in November 2010 which gathered legal and economic scholars and experts of EU Institutions with the aim of presenting and discussing present problems and future challenges of the EU agencies. The diverse set of perspectives contained in the book contributes significantly to rethink the role and nature of the EU agency institutional model, by pointing out some of the most relevant legal issues such as the delegation of powers and the lack of homogeneity of the model, which reflect features and peculiarities of the EU integration process.