220 ILCS 5/10-111
In any hearing, proceeding, investigation, or rulemaking conducted by the Commission, the Commission, commissioner, or administrative law judge presiding, shall, after the close of evidentiary hearings, prepare a recommended or tentative decision, finding, or order, including a statement of findings and conclusions and the reasons or basis therefore, on all the material issues of fact, law, or discretion presented on the record. Such recommended or tentative decision, finding, or order shall be served on all parties who shall be entitled to a reasonable opportunity to respond thereto, either in briefs or comments otherwise to be filed or separately. The recommended or tentative decision, finding, or order and any responses thereto shall be included in the record for decision. This Section shall not apply to any hearing, proceeding, or investigation conducted under Section 13-515.
220 ILCS 5/10-111