A/RES/53/180 Page 3 an international conference on model cities, from 19 to 21 April 1999, and from Germany to hold an international conference, entitled “Urban 21”, in 2000; 9. Invites the Commission on Human Settlements, serving as the preparatory committee, to meet for two working days back-to-back with its forthcoming seventeenth session in order, inter alia, to elect its officers, adopt appropriate rules of procedure and consider the organization of work for its first substantive session, to be held at Nairobi for five working days in May 2000, and invites the preparatory committee, at its first substantive session, to consider the modalities, duration, date and agenda for the second substantive session, to be held in 2001; 10. Invites the Economic and Social Council to devote its coordination segment in 2000 to human settlements issues and the implementation of the Habitat Agenda; 11. Also invites the Economic and Social Council actively to promote and coordinate the role of the regional commissions in the review and appraisal of the implementation of the Habitat Agenda at the regional and subregional levels; 12. Invites the regional commissions, within their mandates and in cooperation with regional intergovernmental organizations and banks, to consider convening high-level meetings to review the progress made in implementing the outcome of the Conference and to report the results of their review to the Economic and Social Council; 13. Requests other relevant organizations and agencies of the United Nations system and the funds and programmes, consistent with their respective mandates, to contribute, as appropriate, to the review and appraisal of the implementation of the Habitat Agenda at the national, regional and global levels; 14. Requests the Secretary-General to seek extrabudgetary resources to assist developing countries, in particular the least developed countries, to send representatives to the sessions of the preparatory committee and the special session of the General Assembly in June 2001 for an overall review and appraisal of the implementation of the Habitat Agenda; 15. Also requests the Secretary-General to report to the General Assembly at its fifty-fourth session on the implementation of the present resolution; 16. Decides to include in the provisional agenda of its fifty-fourth session the sub-item entitled “Implementation of the outcome of the United Nations Conference on Human Settlements (Habitat II)”. 91st plenary meeting 15 December 1998