National parliaments of EU candidate countries and each of the European member countries of NATO (non-EU member states) can be represented by a delegation of observers. The Conference is presided over by the Presidency parliament, in close cooperation with the European Parliament. The high representative for foreign affairs and security policy of the European Union is invited to the meetings to present the priorities and strategies of the EU in this area.

The Inter-Parliamentary Conference may adopt by consensus conclusions on CFSP and CSDP matters related to the agenda of the Conference. The conclusions are not binding on the national Parliaments or the European Parliament, nor do they prejudge their positions. They are usually presented as a joint statement of the co-chairpersons. The Presidency parliament communicates the conclusions to all delegations, to the Presidents of national parliaments and of the European Parliament, to the Presidents of the European Council, the Commission and the high representative of the Union for foreign affairs and security policy, for their information.