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(a). Not later than sixty days before the opening date of the first and each subsequent ordinary meeting of the Assembly of Parties, each Party may submit to the executive organ the names of not more than two legal experts who will be available for the period from the end of such meeting until the end of the second subsequent ordinary meeting of the Assembly of Parties to serve as presidents or members of tribunals constituted in accordance with this Annex. From such nominees the executive organ shall prepare a list of all the persons thus nominated and shall attach to this list any biographical particulars submitted by the nominating Party, and shall distribute such list to all Parties not later than thirty days before the opening date of the meeting in question. If for any reason a nominee becomes unavailable for selection to the panel during the sixty-day period before the opening date of the meeting of the Assembly of Parties, the nominating Party may, not later than fourteen days before the opening date of the meeting of the Assembly of Parties, substitute the name of another legal expert.
(b). From the list mentioned in paragraph (a) of this Article, the Assembly of Parties shall select eleven persons to be members of a panel from which presidents of tribunals shall be selected, and shall select an alternate for each such member. Members and alternates shall serve for the period prescribed in paragraph (a) of this Article. If a member becomes unavailable to serve on the panel, he shall be replaced by his alternate.
(c). For the purpose of designating a chairman, the panel shall be convened to meet by the executive organ as soon as possible after the panel has been selected. Members of the panel may participate in this meeting in person, or through electronic means. The quorum for a meeting of the panel shall be nine of the eleven members. The panel shall designate one of its members as its chairman by a decision taken by the affirmative votes of at least six members, cast in one or, if necessary, more than one secret ballot. The chairman so designated shall hold office as chairman for the rest of his period of office as a member of the panel. The cost of the meeting of the panel shall be regarded as an administrative cost of ITSO.
(d). If both a member of the panel and the alternate for that member become unavailable to serve, the Assembly of Parties shall fill the vacancies thus created from the list referred to in paragraph (a) of this Article. A person selected to replace a member or alternate whose term of office has not expired shall hold office for the remainder of the term of his predecessor. Vacancies in the office of the chairman of the panel shall be filled by the panel by designation of one of its members in accordance with the procedure prescribed in paragraph (c) of this Article.
(e). In selecting the members of the panel and the alternates in accordance with paragraph (b) or (d) of this Article, the Assembly of Parties shall seek to ensure that the composition of the panel will always be able to reflect an adequate geographical representation, as well as the principal legal systems as they are represented among the Parties.
(f). Any panel member or alternate serving on an arbitral tribunal at the expiration of his term shall continue to serve until the conclusion of any arbitral proceeding pending before such tribunal.