Mediation confidentiality requires mediators and parties to keep communications, documents and proceedings confidential and bars their admissibility elsewhere. Rule 21 requires disclosure to the other party of factual information received by a mediator unless the information was given subject to an express confidentiality condition; protects the mediator's records and reports from compelled disclosure; mandates that parties not rely on or introduce mediation communications, confidential documents, mediator proposals or party admissions in other proceedings; and prohibits audio/video recordings and recording of party or witness statements, establishing inadmissibility of mediation communications.