The reform of comitology and the introduction of the new instrument of delegated acts in the Lisbon Treaty were followed by protracted negotiations on the implementation of both articles. This article examines the resultant system that has emerged for both types of non-legislative instruments. In the area of implementing acts, a new regulation sets out important changes: a reduction in the number of procedures, the extension of the scope to trade defence measures and the replacement of a referral to the Council with a new appeal committee. With respect to delegated acts, the search for an overarching framework resulted in a Common Understanding. Our analysis not only demonstrates the need to go beyond the treaty provisions in understanding the nature of non-legislative rule making in the EU, but also emphasises the importance of informal procedures and non-binding agreements in fully assessing the nature of non-legislative rule making in this area.