Ill. Admin. Code tit. 44, § 625.80
a) Following the confirmation of each firm's eligibility, the Director of the requesting Division or Office, or the Director's designated representative(s), and the Consultant Services Unit shall review the firm's experience data, its statement of interest, and any evaluations of its previous work for the Department. Based upon this review, the Consultant Services Unit will rank the firms in order of apparent ability to perform the work. Such review and ranking shall take into consideration at least the following factors:
b) Depending upon the type of project and the method of payment, the following factors may also be important in the selection of a consultant: