The contract clause, Inspection of Services, provides a means to reduce payment to the contractor for services not satisfactorily performed by the contractor. In short, if the Government does not receive the service, it does not pay the contractor. The procedure for withholding payments to a contractor is referred to as "deduction." To legally make a deduction from a contractor payment, the amount deducted must correlate to the price of the service not performed; it may not be an arbitrary figure. Thus, it is necessary to determine what percentage of the total cost of a contract each service performed under that contract represents.