This book offers a (re-)assessment of the balance between executive and legislative powers at both national and European levels taking all these recent changes into account. It asks whether parliaments were truly empowered with the implementation of the Lisbon Treaty or whether this change was in reality much curtailed in the wake of the Eurocrisis and other recent challenges. It brings together lawyers and political scientists to provide a multidisciplinary and multi-level analysis. It firstly examines the imbalance that exists between executive and legislative powers in a multilevel perspective and considers issues such as strategies to recalibrate executive-legislative relations. Secondly, it considers Member States, from an individual and comparative perspective. Finally, it explores the executive-legislative relations in those policy areas which are particularly sensitive to governments, such as trade policies, economic governance, and justice.