The entry into force of the Convention on certain institutions common to the European Communities, on the same date as the Rome Treaties to which it is annexed, provides for the three Communities to share a single Assembly and Court of Justice from the outset.

On 26 July 1960, an internal report by the Luxembourg Government emphasises the importance of the merger of the executive bodies of the three European Communities.

On 28 September 1960, the Italian daily newspaper Il Popolo describes the progress of negotiations on the merging of the European executives and considers the formation and the role of the future Community bodies.

The question of merging the executive bodies is discussed at the November 1960 session of the European Parliamentary Assembly and more specifically at the annual conference with the Councils of Ministers of the European Economic Community, the European Coal and Steel Community and Euratom, based on the report drawn up by Maurice Faure. This report, produced on behalf of the Committee on Political Affairs and Institutional Questions, presents the merger of the executive bodies as a necessary ‘rationalisation measure’.

In October 1961, following the request made on 18 September by the Council of the European Economic Community and the Council of the European Atomic Energy Community, the European Parliamentary Assembly’s Political Committee, with Maurice Faure as rapporteur, submits its draft report on the draft Convention establishing a Council of the European Communities and a European High Commission.

On 20 October 1961, Piero Malvestiti, President of the High Authority of the European Coal and Steel Community, gives an address to the European Parliamentary Assembly in which he gives his views on the question of the merger of the executive bodies.

At the end of a Council of Ministers of the Six, the Luxembourg Minister for Foreign Affairs, Eugène Schaus, explains the position of the Grand Duchy on merging the executives.

Emanuele Gazzo, rédacteur en chef de l'Agence Europe, soulève dans son éditorial du 9 juillet 1964 les problèmes institutionnels à résoudre pour que l'accord sur la fusion des exécutifs puisse être signé.