As Valéry Giscard d’Estaing, the former French president who drafted the EU Constitution wrote in The Independent (‘The EU Treaty is the same as the Constitution’):
"The legal experts for the European Council … charged with drafting the new text … have not made any new suggestions. They have taken the original draft constitution, blown it apart into separate elements, and have then attached them, one by one, to existing treaties. The Treaty of Lisbon is thus a catalogue of amendments. It is unpenetrable for the public.
In terms of content, the proposed institutional reforms – the only ones which mattered to the drafting Convention – are all to be found in the Treaty of Lisbon. They have merely been ordered differently and split up between previous treaties."