Clients who have intellectually chosen mediation as their means of conflict resolution may still experience emotions and tensions that can lead to crisis. Thus, crisis intervention training should be part of all mediator training. When a client loses the ability to cope, the mediator must take emotional control until the client is able to restore coping mechanisms and regain self-control. The mediator's success as a crisis intervenor will determine whether the mediation process can continue. All crises involve several basic processes, resulting in maladaptive behavior that the mediator must interrupt. Mediators must recognize the characteristics of people prone to crisis, the events that can precipitate a crisis, and statements reflecting possible crisis. Arranging the office environment to reduce stress and observing the clients in the waiting room are two ways to help prevent a crisis. Other factors to consider are the process of seating the parties and the opening statement. 3 figures, 3 references, and step-by-step lists of guidelines for effective intervention, handling hostility, ensuring mediator safety, and handling difficult telephone callers.