1. Introduction and preliminary remarks : European Union accountability 2. Accountability within the Commission 3. The access to documents regime in the EU 4. Accountability of the EU decentralised agencies 5. The invisible hand of the EU committee-based system : the case of delegated and implementing acts 6. Accountability through locus standi and the role of the Court of Justice 7. Concluding remarks : what is the future of accountability in the EU?