The role of the parties varies according to their motivations and skills, the role of legal advisers, the model of mediation, the style of mediator and the culture in which the mediation takes place. Legal requirements may also affect their roles. Party-directed mediation (PDM) is an emerging approach involving a pre-caucus between the mediator and each of the parties before going into the joint session. The idea is to help the parties improve their interpersonal negotiation skills so that in the joint session they can address each other with little mediator interference.