In decisions about migration, asylum, justice, and order, the transfer of sovereignty from the Member States to the European Union has been one of the most surprising task expansions in the European project. This book sheds light on these extraordinarily dynamic institutional developments and the resulting policy outcomes. Comprising both conceptual and empirical contributions, the book asks whether established theoretical schools of thought still hold true or whether the institutional conditions induced by the Lisbon Treaty have led to new modes of interaction and given weight to rival explanations. (Series: Politik, Gemeinschaft und Gesellschaft in einer globalisierten Welt - Vol. 10)