1. The General Assembly of the United Nations, having considered chapter II of the report of the International Law Commission on the work of its eighteenth session (A/6309/Rev.l, Part II), which contained final draft articles and commentaries on the law of treaties, decided, by its resolution 2166 (XXI) of 5 December 1966, to convene an international conference of plenipotentiaries to consider the law of treaties and to embody the results of its work in an international convention and such other instruments as it might deem appropriate. By the same resolution, the General Assembly requested the Secretary-General to convoke the first session of the conference early in 1968 and the second session early in 1969. Subsequently, the General Assembly, noting that an invitation had been extended by the Austrian Government to hold both sessions of the conference at Vienna, decided, by resolution 2287 (XXII) of 6 December 1967, that the first session should be coavened at Vienna in March 1968. At its fifth meeting, held on 24 May 1968, at the conclusion of the first session, the Conference adopted a resolution requesting the Secretary-General to make all the necessary arrangements for the Conference to hold its second session at Vienna from 9 April to 21 May 1969.

2. The first session of the United Nations Conference on the Law of Treaties was held at the Neue Hofburg, Vienna, from 26 March to 24 May 1968.