820 ILCS 405/407
As used in this Section, the term "part-time worker" means an individual whose normal work is in an occupation in which his services are not required for the customary scheduled full time hours or days prevailing in the establishment in which he is employed or who, owing to personal circumstances does not customarily work the customary scheduled full time hours or days prevailing in the establishment in which he is employed.
The Director may, in his discretion, after giving interested parties fair notice and opportunity to be heard, prescribe fair and reasonable general rules applicable to part-time workers for determining their weekly benefit amount and their total wages in insured work required to qualify such workers for benefits. Such rules shall, with respect to such workers, supersede any inconsistent provisions of this Act, but, so far as practicable, shall secure results reasonably similar to those provided in the analogous provisions of this Act. Such rules shall be made with due regard to the customary hours or days during which such individual works in such employment and to the wages payable therefor as compared with the wages that would have been payable therefor, if such individual were employed for the full time hours or days during which persons are customarily employed at full time in such work by such employer.
820 ILCS 405/407