In calculating the total cost of ownership, one element that should be included is the cost of raising a purchase order, receiving the category and the transaction costs of managing the payment process. These are collectively acquisition costs. They should be distinguished from the actual invoice value of the goods or services. Contemporary approaches seek to relate the acquisition cost to the value of the goods or services. For example, procurement cards may represent a lower cost way of acquiring certain goods or services rather than raising a purchase order and reconciling and paying a paper invoice. See also Total Cost of Ownership.