This publication is the first in a series of three volumes entitled Proceedings of the Twentieth Session (2005). It includes at the start general information such as membership of the delegations and then the minutes of the Opening and Closing Sessions. The complete text of the Final Act of the Twentieth Session appears thereafter. This is followed by the preliminary documents, the conclusions of the Special Commissions of 2003, 2004 and 2005 on General Affairs and Policy of the Conference, together with the working documents and minutes of the First Commission, which dealt with these questions at the Plenary Session.