Section 115 ILCS 5/10 - Duty to bargain(a) An educational employer and the exclusive representative have the authority and the duty to bargain collectively as set forth in this Section. Collective bargaining is the performance of the mutual obligations of the educational employer and the representative of the educational employees to meet at reasonable times and confer in good faith with respect to wages, hours and other terms and conditions of employment, and to execute a written contract incorporating any agreement reached by such obligation, provided such obligation does not compel either party to agree to a proposal or require the making of a concession.(b) The parties to the collective bargaining process shall not effect or implement a provision in a collective bargaining agreement if the implementation of that provision would be in violation of, or inconsistent with, or in conflict with any statute or statutes enacted by the General Assembly of Illinois. The parties to the collective bargaining process may effect or implement a provision in a collective bargaining agreement if the implementation of that provision has the effect of supplementing any provision in any statute or statutes enacted by the General Assembly of Illinois pertaining to wages, hours or other conditions of employment; provided however, no provision in a collective bargaining agreement may be effected or implemented if such provision has the effect of negating, abrogating, replacing, reducing, diminishing, or limiting in any way any employee rights, guarantees or privileges pertaining to wages, hours or other conditions of employment provided in such statutes. Any provision in a collective bargaining agreement which has the effect of negating, abrogating, replacing, reducing, diminishing or limiting in any way any employee rights, guarantees or privileges provided in an Illinois statute or statutes shall be void and unenforceable, but shall not affect the validity, enforceability and implementation of other permissible provisions of the collective bargaining agreement.(c) The collective bargaining agreement negotiated between representatives of the educational employees and the educational employer shall contain a grievance resolution procedure which shall apply to all employees in the unit and shall provide for binding arbitration of disputes concerning the administration or interpretation of the agreement. The agreement shall also contain appropriate language prohibiting strikes for the duration of the agreement. The costs of such arbitration shall be borne equally by the educational employer and the employee organization.(d) Once an agreement is reached between representatives of the educational employees and the educational employer and is ratified by both parties, the agreement shall be reduced to writing and signed by the parties.