The term has two meanings. As a budgetary term, it represents variables that cannot be recorded as valid obligations. Such variables include (1) outstanding fixed price contracts containing escalation, price redetermination, or incentive clauses, or (2) contracts authorizing variations on quantities to be delivered, or (3) contracts where allowable interest may become payable by the U.S. Government on contractor claims supported by written appeals pursuant to the "DISPUTES" clause contained in the contract. As a proprietary accounting term, it represents a contingency posing the possibility of a loss when one or more events occur or fail to occur. Examples of loss contingencies include the collectability of receivables, pending or threatened litigation, and possible claims and assessments. DoD recognizes contingent liabilities when a future loss related to past events or exchange transactions is probable and the loss amount can be reasonable estimated.