In this session, we concentrate on new tools or instruments used by the EU to influence domestic compliance. We herein particularly focus on new, or changing, initiatives at the European level that help the EU institutions – mostly the European Commission – to better control, and thus stimulate, domestic compliance. Heidbreder’s paper concentrates on the coordination of policy implementation in multilevel administrative settings. She analyzes the horizontal capacity pooling by the European Commission in the newly emerging European Administrative Space. In a similar vein, Sindberg Martinsen and Hobolth’s paper analyses the role of Solvit – the EU’s internal market problem-solving network – in enforcing and managing the daily application of EU internal market legislation. As a third EU solution to improving compliance, Polak’s paper investigates the role of the European Aviation Safety Agency in the implementation of the Safety Assessment of Foreign Aircraft Directive. As a conclusion to the session, the last paper by De la Porte analyzes how the Open Method of Coordination (OMC) has developed from a voluntary policy coordination mechanism to a coercive mechanism.