20 ILCS 415/8b.14

For the promotion of staff development and utilization by means of records of performance of all employees in the State service. The performance records may be considered in determining salary increases, provided in the pay plan, and as a factor in promotion tests or promotions. The performance records shall be considered as a factor in determining salary decreases, the order of layoffs because of lack of funds or work, reinstatement, demotions, discharges and geographical transfers.