70 ILCS 1215/11
Whenever a position classified under this Act is to be filled the appointing officer shall make requisition upon said civil service board, and said board shall certify to him the name and address of the candidate standing highest upon the register of eligibles for said position. The appointing officer shall notify the board of each position to be filled separately and shall fill such position by the appointment of the person certified to him by said board therefor, which appointment shall be on probation for a period of not more than six (6) months to be fixed by said rules. At any time during the period of probation the appointing officer may discharge the person so certified and shall forthwith notify the board in writing of such discharge. If such person is not thus discharged his or her appointment shall be deemed complete.
When there is no eligible list, the appointing officer may, with the authority of the Civil Service Board, make temporary appointments to remain in force only until regular appointments under the provisions of this Act can be made; an examination to supply an eligible list therefor shall be held and an eligible list established therefrom within a reasonable time thereafter.
In employment of an essentially temporary and transitory nature, the appointing officer may, with the authority of said Civil Service Board, make temporary appointments to fill a vacancy, but no such authority shall be granted for a period of more than thirty (30) days, but it may be renewed from time to time by the Civil Service Board. The acceptance or refusal by an eligible person of a temporary appointment shall not affect his or her standing on the register for permanent employment. Except as may be otherwise provided by law, the words "appointing officer" as used herein, shall be taken and construed to mean, in each case, the Board of Trustees of the Park Employees' Annuity and Benefit Fund or such other officers or employees of the Park Employees' and Retirement Board Employees' Annuity and Benefit Fund to whom they may from time to time delegate or grant the power of appointment.
70 ILCS 1215/11