Section 735 ILCS 5/2-802 - Order and findings relative to the class(a) Determination of Class. As soon as practicable after the commencement of an action brought as a class action, the court shall determine by order whether it may be so maintained and describe those whom the court finds to be members of the class. This order may be conditional and may be amended before a decision on the merits.(b) Class Action on Limited Issues and Sub-classes. When appropriate, an action may be brought or maintained as a class action with respect to particular issues, or divided into sub-classes and each sub-class treated as a class. The provisions of this rule shall then be construed and applied accordingly.