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(a). Within sixty days from the date copies of the document described in paragraph (a) of Article 4 of this Annex have been received by all the respondents, the side of the respondents shall designate an individual to serve as a member of the tribunal. Within that period, the respondents may, jointly or individually, provide each disputant and the executive organ with a document stating their responses to the document referred to in paragraph (a) of Article 4 of this Annex and including any counterclaims arising out of the subject matter of the dispute. The executive organ shall promptly furnish the chairman of the panel with a copy of any such document.
(b). In the event of a failure by the side of the respondents to make such a designation within the period allowed, the chairman of the panel shall make a designation from among the experts whose names were submitted to the executive organ pursuant to paragraph (a) of Article 3 of this Annex.
(c). Within thirty days after the designation of the two members of the tribunal, they shall agree on a third person selected from the panel constituted in accordance with Article 3 of this Annex, who shall serve as the president of the tribunal. In the event of failure to reach agreement within such period of time, either of the two members designated may inform the chairman of the panel, who, within ten days, shall designate a member of the panel other than himself to serve as president of the tribunal.
(d). The tribunal is constituted as soon as the president is selected.