83. Member States and observers, including States that are not members of the Council, the specialized agencies, other intergovernmental organizations and national human rights institutions, as well as nongovernmental organizations shall be entitled to participate in the work of the Advisory Committee based on arrangements, including Economic and Social Council resolution 1996/31 and practices observed by the Commission on Human Rights and the Council, while ensuring the most effective contribution of these entities. 84. The Council will decide at its sixth session (first session of its second cycle) on the most appropriate mechanisms to continue the work of the Working Groups on Indigenous Populations; Contemporary Forms of Slavery; Minorities; and the Social Forum. IV. COMPLAINT PROCEDURE A. Objective and scope 85. A complaint procedure is being established to address consistent patterns of gross and reliably attested violations of all human rights and all fundamental freedoms occurring in any part of the world and under any circumstances. 86. Economic and Social Council resolution 1503 (XLVIII) of 27 May 1970 as revised by resolution 2000/3 of 19 June 2000 served as a working basis and was improved where necessary, so as to ensure that the complaint procedure is impartial, objective, efficient, victims-oriented and conducted in a timely manner. The procedure will retain its confidential nature, with a view to enhancing cooperation with the State concerned. B. Admissibility criteria for communications 87. A communication related to a violation of human rights and fundamental freedoms, for the purpose of this procedure, shall be admissible, provided that: (a) It is not manifestly politically motivated and its object is consistent with the Charter of the United Nations, the Universal Declaration of Human Rights and other applicable instruments in the field of human rights law; (b) be violated; It gives a factual description of the alleged violations, including the rights which are alleged to (c) Its language is not abusive. However, such a communication may be considered if it meets the other criteria for admissibility after deletion of the abusive language; (d) It is submitted by a person or a group of persons claiming to be the victims of violations of human rights and fundamental freedoms, or by any person or group of persons, including non-governmental organizations, acting in good faith in accordance with the principles of human rights, not resorting to politically motivated stands contrary to the provisions of the Charter of the United Nations and claiming to have direct and reliable knowledge of the violations concerned. Nonetheless, reliably attested communications shall not be inadmissible solely because the knowledge of the individual authors is second-hand, provided that they are accompanied by clear evidence; (e) It is not exclusively based on reports disseminated by mass media; (f) It does not refer to a case that appears to reveal a consistent pattern of gross and reliably attested violations of human rights already being dealt with by a special procedure, a treaty body or other United Nations or similar regional complaints procedure in the field of human rights; (g) Domestic remedies have been exhausted, unless it appears that such remedies would be ineffective or unreasonably prolonged. 88. National human rights institutions, established and operating under the Principles Relating to the Status of National Institutions (the Paris Principles), in particular in regard to quasi-judicial competence, may serve as effective means of addressing individual human rights violations.