Abstract: A banknote validator/dispenser having a plurality of banknote accumulators includes a computer control module that stores banknote receipt and dispensing transaction history information. The computer control module uses this information as part of a statistical analysis used to vary an operating procedure of the banknote validator/dispenser. In one embodiment, the operating procedure is associated with a decision whether to accept a transaction requiring the dispensing of change from banknotes stored in the banknote accumulators. This decision includes an assessment of the ability to accept future transactions if the current transaction is accepted. In a different embodiment the operating procedure is associated with a change in the denomination of banknotes being accumulated.