Ill. Admin. Code tit. 44, § 2000.2045
a) General
b) Professional and Artistic Services
1) Any prequalification of vendors of professional and artistic services shall include, at a minimum, a specified level of:
C) technical ability;
and may require certification or licensure, or membership in professional associations.
c) Qualified Products Lists
Qualified products lists are treated in Section 2000.2050 (Specifications and Samples) of this Part.