The author presents a succinct list of ethical principles for mediators. They include avoiding conflicts of interests; being candid about their background and experience and avoiding cases they don't have the expertise to handle; remaining impartial; ensuring that parties participate voluntarily, are adequately informed and maintain autonomy in making decisions; maintaining confidentiality and informing parties of the limits of confidentiality; adapting the mediation process to avoid escalating the conflict; considering the interests of parties not involved in the mediation; and remaining honest.
Ten Principles of Mediation Ethics
Hoffman, David A. Alternatives to the High Cost of Litigation, Sep. 1, 2000http://bostonlawcollaborative.com/blc/72-BLC/version/default/part/AttachmentData/data/2005-07-mediation-ethics.pdf?branch=main&language=default