(1) Contracting Parties shall endeavour to settle disputes concerning the application or interpretation of this Treaty through diplomatic channels.

(2) If a dispute has not been settled in accordance with paragraph (1) within a reasonable period of time, either party thereto may, except as otherwise provided in this Treaty or agreed in writing by the Contracting Parties, and except as concerns the application or interpretation of Article 6 or Article 19 or, for Contracting Parties listed in Annex IA, the last sentence of Article 10(1), upon written notice to the other party to the dispute submit the matter to an ad hoc tribunal under this Article.

(3) Such an ad hoc arbitral tribunal shall be constituted as follows:

• (a) The Contracting Party instituting the proceedings shall appoint one member of the tribunal and inform the other Contracting Party to the dispute of its appointment within 30 days of receipt of the notice referred to in paragraph (2) by the other Contracting Party;
• (b) Within 60 days of the receipt of the written notice referred to in paragraph (2), the other Contracting Party party to the dispute shall appoint one member. If the appointment is not made within the time limit prescribed, the Contracting Party having instituted the proceedings may, within 90 days of the receipt of the written notice referred to in paragraph (2), request that the appointment be made in accordance with subparagraph (d);
• (c) A third member, who may not be a national or citizen of a Contracting Party party to the dispute, shall be appointed by the Contracting Parties parties to the dispute. That member shall be the President of the tribunal. If, within 150 days of the receipt of the notice referred to in paragraph (2), the Contracting Parties are unable to agree on the appointment of a third member, that appointment shall be made, in accordance with subparagraph (d), at the request of either Contracting Party submitted within 180 days of the receipt of that notice;
• (d) Appointments requested to be made in accordance with this paragraph shall be made by the Secretary General of the Permanent Court of International Arbitration within 30 days of the receipt of a request to do so. If the Secretary General is prevented from discharging this task, the appointments shall be made by the First Secretary of the Bureau. If the latter, in turn, is prevented from discharging this task, the appointments shall be made by the most senior Deputy;
• (e) Appointments made in accordance with subparagraphs (a) to (d) shall be made with regard to the qualifications and experience, particularly in matters covered by this Treaty, of the members to be appointed;
• (f) In the absence of an agreement to the contrary between the Contracting Parties, the Arbitration Rules of UNCITRAL shall govern, except to the extent modified by the Contracting Parties parties to the dispute or by the arbitrators. The tribunal shall take its decisions by a majority vote of its members;
• (g) The tribunal shall decide the dispute in accordance with this Treaty and applicable rules and principles of international law;
• (h) The arbitral award shall be final and binding upon the Contracting Parties parties to the dispute;
• (i) Where, in making an award, a tribunal finds that a measure of a regional or local government or authority within the Area of a Contracting Party listed in Part I of Annex P is not in conformity with this Treaty, either party to the dispute may invoke the provisions of Part II of Annex P;
• (j) The expenses of the tribunal, including the remuneration of its members, shall be borne in equal shares by the Contracting Parties parties to the dispute. The tribunal may, however, at its discretion direct that a higher proportion of the costs be paid by one of the Contracting Parties parties to the dispute;
• (k) Unless the Contracting Parties parties to the dispute agree otherwise, the tribunal shall sit in The Hague, and use the premises and facilities of the Permanent Court of Arbitration;
• (l) A copy of the award shall be deposited with the Secretariat which shall make it generally available.