The provision relating to the adoption, ratification and entry into force of the Treaty establishing the Constitution for Europe is probably one of the most difficult ones, both in legal and political terms. It is supposed to define the legal nature and quality of the entire EU process in its present and future phase. There is an inherent ambiguity about the legal nature of the treaty, which is already apparent in the title, and there are profound political implications as well. Is the Treaty establishing a Constitution for Europe a treaty or a constitution? Can it be both or neither? These are hard questions indeed.