On 14 January 1964, addressing the Consultative Assembly of the European Council, the Belgian Foreign Minister, Paul-Henri Spaak, challenges the idea that the Community of the Six is a failure and calls for enhanced European unity.

In seinen Memoiren begründet Robert Marjolin den Ursprung der fortwährenden Krisen die die Europäische Wirtschaftsgemeinschaft (EWG) im Laufe der sechziger Jahren erschüttert haben.

On 21 May 1964, Johannes Linthorst Homan, Netherlands Member of the High Authority of the European Coal and Steel Community (ECSC), addresses the Geneva Branch of the Union of European Federalists about the difficulties involved in and hopes for European integration.

Working session of the members of the Commission of the European Economic Community (EEC) in office from 10 January 1958 to 6 July 1967, under the presidency of Walter Hallstein. From left to right (starting with Sicco Mansholt, on the left, with his pipe): Sicco Mansholt, Robert Marjolin, Lambert Schaus, Lionello Levi Sandri, Guido Colonna di Paliano, Hans von der Groeben, Walter Hallstein, Émile Noël, Executive Secretary of the Commission, and Jean Rey.

In his Memoirs, Johannes Linthorst Homan, former Netherlands Member of the High Authority of the European Coal and Steel Community (ECSC), recalls the institutional crisis that shook the European Community in 1965–1966.

In einem am 18. September 1964 von RTL ausgestrahlten Interview schlägt der belgische Außenminister Paul-Henri Spaak seinen Partnern vor, den Fouchet-Plan erneut auf den Tisch zu bringen, um das Europa der Sechs aus der Starre zu erlösen, in der es sich zu befinden scheint.

On 16 July 1965, the Italian daily newspaper Corriere della Sera analyses the political and economic causes of the internal crisis affecting the European Economic Community (EEC).