Pattern of conferences A/RES/69/250 Christmas, and encourages this arrangement be taken into account when drafting future calendars of conferences and meetings; 10. Requests the Secretary-General to ensure that any modification to the calendar of conferences and meetings is implemented strictly in accordance with the mandate of the Committee on Conferences and other relevant resolutions of the General Assembly; 11. Invites Member States to include in new legislative mandates adequate information on the modalities for the organization of conferences or meetings; 12. Recalls rule 153 of its rules of procedure, and, for resolutions involving expenditure, requests the Secretary-General to include the modalities of conferences, taking into account the trends of similar meetings, with a view to mobilizing conference services and documentation in the most efficient and costeffective manner possible; 13. Reaffirms the need to address the issue of duplications and redundancies in conference servicing, and notes in this regard that the Economic and Social Council decided in its resolution 2013/13 of 22 July 2013 to consider at a later date the necessity of reviewing its provisional biennial calendar of conferences and meetings in the light of the ongoing intergovernmental consultations on the further strengthening of the Council; II A. Utilization of conference-servicing resources 14. Reaffirms the practice that, in the use of conference rooms, priority must be given to meetings of Member States; 15. Calls upon the Secretary-General and Member States to adhere to the guidelines and procedures contained in the administrative instruction for the authorization of the use of United Nations premises for meetings, conferences, special events and exhibits; 5 16. Emphasizes that such meetings, conferences, special events and exhibits must be consistent with the purposes and principles of the United Nations; 17. Notes that the overall utilization factor at the four main duty stations in 2013 was 82 per cent, that in 2012 it was 84 per cent and that in 2011 it was 85 per cent, which is above the established benchmark of 80 per cent; 18. Welcomes the steps taken by those bodies that have adjusted their programmes of work in order to achieve the optimum utilization of conferenceservicing resources, and requests the Committee on Conferences to intensify consultations with the secretariats and bureaux of bodies that underutilize their conference-servicing resources; 19. Also welcomes the efforts undertaken by the Secretary-General to increase the utilization rates of conference-servicing resources, and in this regard encourages the Secretary-General to enhance the efficiency of conference servicing and to report thereon to the General Assembly at its seventieth session; _______________ 5 ST/AI/416. 3/15