710 ILCS 30/25-10
In arbitral proceedings with more than one arbitrator, any decision of the arbitral tribunal shall be made, unless otherwise agreed by the parties, by a majority of all its members. However, questions of procedure may be decided by a presiding arbitrator, if so authorized by the parties or all members of the arbitral tribunal.
(Source: P.A. 90-631, eff. 7-24-98.)