English: * = establishment of the ECSC Common Assembly (1952)
- = establishment of an Assembly common for the ECSC, EEC and EURATOM (1958)
- = Christian-Democratic Group (Group of the European People's Party) (1978-1979)
- = Technical Coordination and Defence of Independent Groups and Members (1987)
- = Group for the Technical Coordination and Defence of Independent Groups and Members (1979-1984)
- = Rainbow Group: Federation of the Green-Alternative European Links, Agelev-Ecolo, the Danish People's Movement against Membership of the European Community and the European Free Alliance in the European Parliament (1984-1989)
- = Confederal Group of the European United Left (1994-1995)
UNR = Union for the New Republic (L'Union pour la nouvelle République) PDS = Democratic Party of the Left (Partito Democratico della Sinistra) FI = Forza Italia
RPR = Rally for the Republic (Rassemblement pour la République)
Čeština: * = vznik Společného shromáždění ESUO (1952)
- = vznik Shromáždění společného pro ESUO, EHS a EURATOM (1958)
- = Christian-Democratic Group (Group of the European People's Party) (1978-1979)
- = Technical Coordination and Defence of Independent Groups and Members (1987)
- = Group for the Technical Coordination and Defence of Independent Groups and Members (1979-1984)
- = Rainbow Group: Federation of the Green-Alternative European Links, Agelev-Ecolo, the Danish People's Movement against Membership of the European Community and the European Free Alliance in the European Parliament (1984-1989)
- = Confederal Group of the European United Left (1994-1995)
UNR = L'Union pour la nouvelle République PDS = Partito Democratico della Sinistra FI = Forza Italia
RPR = Sdružení pro republiku (Rassemblement pour la République)