THE MEDIATION RULES OF CHICAGO INTERNATIONAL DISPUTE RESOLUTION ASSOCIATION (CIDRA) ARTICLE 12 - CIDRA OVERSIGHT 1) If the other party does not agree to the challenge and the challenged mediator or co-mediator does not wish to withdraw, the decision on the challenge will be made by CIDRA. 2) If CIDRA sustains the challenge, a substitute mediator or co-mediator shall be appointed or chosen pursuant to the procedure described in Articles 7 or 8, as appropriate.