Compensation & Benefits: Salary Range: As established by the current Agreement between Board of Education, Proviso Township High Schools District No. 209, Cook County, Illinois and the Proviso Teachers Union, Local 571, AFL-CIO. Work Environment/Conditions: As established by the current Agreement between Board of Education, Proviso Township High Schools District No. 209, Cook County, Illinois and the Proviso Teachers Union, Local 571, AFL-CIO.