Consisting of a two part structure, this book is focussed in Part I on more general trends of the EU’s long-term participation with(in) International Organisations (IOs) and in Part II on more precise case studies on labour standards, public services, flexicurity, human trafficking and security. This book asks why the EU has been involved with(in) IOs on such a long-term basis? How? With what impact? These three key research questions are addressed in this innovative volume, in a bid to explore the continuity of EU action with(in) IOs. This volume will be highly useful for students, academics and experts, combining a clear and easy-to-use framework with new empirical data.