On 24 March 1956, the Information Service of the European Coal and Steel Community (ECSC) High Authority publishes a note on the session held by the ECSC Parliamentary Assembly on 16 March 1956 in Brussels on the theme of European revival. During this session, the Assembly of the Six expressed its political support for the ongoing negotiations between experts meeting under the leadership of Paul-Henri Spaak. The note identifies a convergence of views in political circles on the matters under negotiation.

On 21 January 1959, the High Authority decides that the definition of the unit of account as used in ECSC texts should be the same as the accounting unit of the European Monetary Agreement with effect from 27 December 1958.

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.

Plaque affixed to the façade of the former building of the High Authority of the European Coal and Steel Community, Luxembourg.

Organisation chart of the ECSC High Authority (situation in June 1967).

Seated from left to right during a meeting held in Luxembourg on 13 January 1958: Walter Hallstein, President of the EEC Commission; Paul Finet, President of the ECSC High Authority; and Louis Armand, President of the Euratom Commission.

On 8 May 1956, at the end of the Geneva Tariff Conference, Austria and the High Authority of the European Coal and Steel Community (ECSC) sign two agreements: a protocol on an anti-dumping clause on trade in steel outside the framework of the General Agreement on Tariffs and Trade (GATT) and a tariff agreement on the reduction of customs duties under the GATT.

In this discussion paper of 3 May 1950, Jean Monnet considers the compatibility between the international control of the Ruhr and the establishment of the High Authority of the European Coal and Steel Community (ECSC).

On 29 June 1954, the City of Liège officially submits its application to become the seat of the High Authority of the European Coal and Steel Community (ECSC), setting out in a dossier its arguments and the support given to these arguments by an international college of town planners.

On 10 January 1953, the ECSC High Authority reports on the setting up of the various Community institutions and expresses its satisfaction regarding the good relations being established between these institutions and the external bodies.