The institutions of the EEC would take over responsibilities for the running of the EEC and Euratom, with all three then becoming known as the European Communities even if each legally existed separately.
EØF's institutioner overtog ansvaret for driften af EKSF og Euratom, således at de tre organisationer sammen blev kendt som De Europæiske Fællesskaber, selvom de juridisk set eksisterede adskilt fra hinanden.