Contingency - When estimating the cost for a project, product or other item or investment, there is always uncertainty as to the precise content of all items in the estimate, how work will be performed, what work conditions will be like when the project is executed and so on.
An arbitrator is one who delivers a fair judgment to resolve a dispute. The arbitrator's decision may or may not be favorable to one or more parties involved; however, the arbitrator is a neutral third party chosen by the disputing parties in lieu of litigating in court.
umpire. UMPIRE. A person selected by two or more arbitrators. When they are authorize to do so by the submission of the parties, and they cannot agree as to the subject-matter referred to them, whose duty it is to decide the matter in dispute.