What happens when the parties to a contract have chosen an arbitration institution, but not specified the number of arbitrators to resolve the dispute? In effect, the parties have already chosen the number of arbitrators, because arbitration institutions have provisions for choosing the number of arbitrators when the arbitration clause is silent. If the parties adopted a summary/expedited procedure, they have elected a single arbitrator.
Institutions take varied positions on the implied number of arbitrators assigned to a tribunal. All authorities agree that the choice is only between one and three arbitrators.
The graph below displays the positions taken by the rules of four institutions, CIETAC, BAC, SIAC, and HKIAC, as well as the UNCITRAL rules. The implied number of arbitrators are given, and whether the determinate implication of number is presumptive or firm is indicated. Note that the implied number below do not reflect separate and distinct Summary/Expedited Procedures.