(a) Each party or interested person shall amend or supplement a previously filed pleading or other document if she or he learns of a material change that may affect the outcome of the administrative proceeding. However, no amendment or supplement may broaden the issues without an opportunity for any other party or interested person both to reply to it and to prepare for the broadened issues.

(b) The ALJ may allow other amendments or supplements to previously filed pleadings or other documents.

(c) Each party or interested person shall notify the Hearing Docket Clerk, the ALJ, and every other party or interested person, or her or his representative, of any change of address.