C. Working groups 89. Two distinct working groups shall be established with the mandate to examine the communications and to bring to the attention of the Council consistent patterns of gross and reliably attested violations of human rights and fundamental freedoms. 90. Both working groups shall, to the greatest possible extent, work on the basis of consensus. In the absence of consensus, decisions shall be taken by simple majority of the votes. They may establish their own rules of procedure. 1. Working Group on Communications: composition, mandate and powers 91. The Human Rights Council Advisory Committee shall appoint five of its members, one from each Regional Group, with due consideration to gender balance, to constitute the Working Group on Communications. 92. In case of a vacancy, the Advisory Committee shall appoint an independent and highly qualified expert of the same Regional Group from the Advisory Committee. 93. Since there is a need for independent expertise and continuity with regard to the examination and assessment of communications received, the independent and highly qualified experts of the Working Group on Communications shall be appointed for three years. Their mandate is renewable only once. 94. The Chairperson of the Working Group on Communications is requested, together with the secretariat, to undertake an initial screening of communications received, based on the admissibility criteria, before transmitting them to the States concerned. Manifestly ill-founded or anonymous communications shall be screened out by the Chairperson and shall therefore not be transmitted to the State concerned. In a perspective of accountability and transparency, the Chairperson of the Working Group on Communications shall provide all its members with a list of all communications rejected after initial screening. This list should indicate the grounds of all decisions resulting in the rejection of a communication. All other communications, which have not been screened out, shall be transmitted to the State concerned, so as to obtain the views of the latter on the allegations of violations. 95. The members of the Working Group on Communications shall decide on the admissibility of a communication and assess the merits of the allegations of violations, including whether the communication alone or in combination with other communications appear to reveal a consistent pattern of gross and reliably attested violations of human rights and fundamental freedoms. The Working Group on Communications shall provide the Working Group on Situations with a file containing all admissible communications as well as recommendations thereon. When the Working Group on Communications requires further consideration or additional information, it may keep a case under review until its next session and request such information from the State concerned. The Working Group on Communications may decide to dismiss a case. All decisions of the Working Group on Communications shall be based on a rigorous application of the admissibility criteria and duly justified. 2. Working Group on Situations: composition, mandate and powers 96. Each Regional Group shall appoint a representative of a member State of the Council, with due consideration to gender balance, to serve on the Working Group on Situations. Members shall be appointed for one year. Their mandate may be renewed once, if the State concerned is a member of the Council. 97. Members of the Working Group on Situations shall serve in their personal capacity. In order to fill a vacancy, the respective Regional Group to which the vacancy belongs, shall appoint a representative from member States of the same Regional Group.