70 ILCS 1215/16
The Civil Service Board shall investigate the efficiency of all officers and employees and of all groups of officers and employees in the classified service and shall report to each officer, board or other authority in charge of any office or department of the Park Employees' and Retirement Board Employees' Annuity and Benefit Fund, its findings and recommendations relative to increasing efficiency and economy therein. In case the recommendations made by the board are not carried into effect within a reasonable time, or in case of a difference of opinion with reference to such findings or recommendations between the Civil Service Board and the officer or authority in charge of an office or department concerned in any such findings or recommendations, the report, accompanied by a note of the relevant facts shall be submitted to the Board of Trustees of the Park Employees' and Retirement Board Employees' Annuity and Benefit Fund by the Civil Service Board. The Civil Service Board shall investigate the enforcement of this Act and of the rules of the Board, the conduct of the appointees in the classified service, and the methods of administration therein, and may investigate the nature, tenure and compensation of all offices and places in the civil service of the Park Employees' and Retirement Board Employees' Annuity and Benefit Fund. In the course of such investigation said Civil Service Board shall have power to administer oaths and to secure by subpoena both the attendance and testimony of witnesses and the production of books and records.
70 ILCS 1215/16