The United Nations Disarmament Yearbook, volume 42 (Part II): 2017, with a foreword by the High Representative for Disarmament Affairs, summarizes developments and trends in 2017 on key issues of multilateral consideration at the international and regional levels; reviews the activity of the General Assembly, the Conference on Disarmament and the Disarmament Commission; and contains a handy timeline of highlights of multilateral disarmament in 2017.