(a) Save where expressly stated to the contrary in this Agreement, any dispute, difference or controversy of whatever nature between the Parties, howsoever arising under, out of or in relation to this agreement (the "Dispute") shall in the first instance be attempted to be resolved amicably in accordance with the procedure set forth in sub article (b) below. (b) Either Party may require such Dispute to be referred to the executive head of the Concessioning Authority, and the Chief Executive Officer or equivalent officer of the Concessionaire for the time being, for amicable settlement. In respect disputes of a technical nature the Parties may engage an Expert. Upon such reference, the two shall meet at the earliest mutual convenience and in any event within 15 (fifteen) days of such reference to discuss and attempt to amicably resolve the Dispute. If the Dispute is not amicably settled within 15 (fifteen) days of such meeting between the two, either Party may refer the Dispute to arbitration in accordance with the provisions of Article 12.2 below. 12.2 Arbitration