105 ILCS 5/27-22.05
Notwithstanding any other provision of this Article or this Code, a school board that maintains any of grades 9 through 12 is authorized to adopt a policy under which a student who is enrolled in any of those grades may satisfy one or more high school course or graduation requirements, including, but not limited to, any requirements under Sections 27-6 and 27-22, by successfully completing a registered apprenticeship program under rules adopted by the State Board of Education under Section 2-3.175 of this Code, or by substituting for and successfully completing in place of the high school course or graduation requirement a related vocational or technical education course. A vocational or technical education course shall not qualify as a related vocational or technical education course within the meaning of this Section unless it contains at least 50% of the content of the required course or graduation requirement for which it is substituted, as determined by the State Board of Education in accordance with standards that it shall adopt and uniformly apply for purposes of this Section. No vocational or technical education course may be substituted for a required course or graduation requirement under any policy adopted by a school board as authorized in this Section unless the pupil's parent or guardian first requests the substitution and approves it in writing on forms that the school district makes available for purposes of this Section.
105 ILCS 5/27-22.05