A/HRC/20/39 plenary. The Fund has also been used to organize and fund the participation of officials in field-based preparatory briefings for the universal periodic review. 24. Although the parameters for financing the participation of developing country Member States in the universal periodic review sessions are consistent with established practice for the General Assembly, the post facto reimbursement procedure has proven unsatisfactory, as the recipient Member States have experienced difficulties in submitting the required documentation to enable the settlement of the claims. The secretariat is therefore proposing a revision of the terms of reference for the Fund to make it possible for tickets to be provided in advance of the sessions. Upon approval of the proposed modifications, a detailed note with the revised modalities will be circulated to all delegations. 25. During the review of the work and functioning of the Human Rights Council, Member States again requested that the Fund be strengthened and operationalized in order to encourage the significant participation of developing countries, particularly least developing countries; they also requested that special attention be given to small island developing States (Council resolution 16/21, para. 14). Accordingly, the secretariat is proposing that that the revision of the terms of reference of the Fund provide for a more substantial travel assistance for least developing countries and small island developing States. 26. As regards the pre-session briefings organized by the secretariat, it is planned to further pursue the recently initiated shift to interregional briefings. Moreover, it is proposed that national human rights institutions consistent with the principles relating to the status of national institutions for the promotion and protection of human rights (Paris Principles) be more systematically associated with these briefings. 9