30 ILCS 500/35-25: Uniformity in contract.

(a) The chief procurement officer for matters other than construction and the higher education chief procurement officer shall each develop, cause to be printed, and distribute uniform documents for the contracting of professional and artistic services.

(b) All chief procurement officers, State purchasing officers, and their designees shall use the appropriate uniform contracts and forms in contracting for all professional and artistic services.

(c) These contracts and forms shall include in detail, in writing, at least:

(1) the detail listed in subsection (c) of Section 35-20;

(2) the duration of the contract, with a schedule of delivery, when applicable;

(3) the method for charging and measuring cost (hourly, per day, etc.);

(4) the rate of remuneration; and

(5) the maximum price.