THE MEDIATION RULES OF CHICAGO INTERNATIONAL DISPUTE RESOLUTION ASSOCIATION (CIDRA) ARTICLE 11 - PROCEDURES FOR CHALLENGE 1) A party who intends to challenge a mediator shall send notice of the challenge within fifteen days after CIDRA has been notified of the appointment of the challenged mediator or within fifteen days after circumstances described in Articles 9 and 10 have become known to the challenging party. 2) The challenge shall be communicated to CIDRA and the other party or parties. The notification shall be in writing and shall state the reasons for the challenge.