Arbitration is a formal method of alternate dispute resolution where the parties voluntarily agree to let their dispute be left to the judgment of an Arbitrator or a panel of Arbitrators, who are neutral. An Arbitrator is independent and usually has legal and expert knowledge of the type of dispute eg. in a commercial dispute, a surveyor may arbitrate in a dispute between a builder and a developer. Package holiday contracts usually include a clause providing for arbitration through Association of British Travel Agents (ABTA) e.g. holiday maker and tour operator.