20 ILCS 525/5-25

(a) A quorum at any regular or special meeting of the Advisory Council shall be necessary to transact business and shall consist of one-third of the duly appointed members of the Advisory Council. For the purpose of election of officers, the necessary quorum shall be a majority of the duly appointed members. (b) For the purpose of subcommittee action, a quorum shall consist of at least one-half of those members appointed to the subcommittee, but in no event fewer than 2 individuals. (c) All deliberations of the Advisory Council and its subcommittees shall be governed by Robert's Rules of Order.