(3)  If the parties have not appointed arbitrator(s) or have not provided the method of appointment as provided in Paragraph (1) of this Article, or if the Secretariat appoints an arbitrator(s) in accordance with c) and d) of Paragraph (2) of this Article, an arbitrator(s) shall be appointed by the Secretariat applying Article 21 mutatis mutandis.

Article 21. Appointment by Secretariat

(1) If, after the acceptance of a claim, there is no hope of settlement by conciliation or such conciliation proves unsuccessful as provided in Article 18, the Secretariat shall without delay furnish both parties with a list of several candidate arbitrators by choosing from among the Panel of Arbitrators.
(2) Within 15 days from the date of receipt of the list in case of Domestic Arbitration, and within 30 days from the date of receipt of the list in case of International Arbitration, each party shall return to the Secretariat the list of such candidates as provided in Paragraph (1) after marking by number the order of his preference of the names of the candidates in the respective columns of the said list for a presiding arbitrator and the other arbitrators. If a party or parties fail to return the list within the above period, all of the candidates shall be deemed to be of the same preference and if more than two candidates are marked on the same order of preference or no particular order of preference is marked on candidate(s) or if the name(s) to which each party objects has been deleted, then the KCAB shall adjust the order of preference giving due consideration to the opponent's order of preference. The remaining names on the list shall be given the following order of preference: more than two candidates who have been marked on the same order of preference; candidate(s) for whom no particular order of preference is marked; and candidates who have been deleted.