A/RES/54/91 Page 5 of all possible assistance, on both a bilateral and a multilateral basis, in the strengthening of the economies of those Territories; 14. Reaffirms that the United Nations visiting missions to the Territories are an effective means of ascertaining the situation in the Territories as well as the wishes and aspirations of their inhabitants, and calls upon the administering Powers to continue to cooperate with the Special Committee in the discharge of its mandate and to facilitate visiting missions to the Territories; 15. Calls upon the administering Powers that have not participated formally in the work of the Special Committee to do so at its session in 2000; 16. Requests the Secretary-General, the specialized agencies and other organizations of the United Nations system to provide economic, social and other assistance to the Non-Self-Governing Territories and to continue to do so, as appropriate, after they exercise their right to self-determination, including independence; 17. Requests the Secretary-General to provide the Special Committee with the facilities and services required for the implementation of the present resolution, as well as of the other resolutions and decisions on decolonization adopted by the General Assembly and the Special Committee. 71st plenary meeting 6 December 1999