At the request of a party, the Tribunal may order the joinder of an additional party to the arbitration provided all parties, including the additional party, agree. Any such order shall take account of all relevant circumstances, including the stage reached in the arbitration. The request shall be addressed together with the Request for Arbitration or the Answer to the Request, as the case may be, or, if a party becomes aware at a later stage of circumstances that it considers relevant for a joinder, within 15 days after acquiring that knowledge.
Consolidation