Used to account for any activity for which a fee is charged to external users for goods or services. Activities are required to be reported as enterprise funds if, in the context of the activity's principal revenue sources, either of the following criteria is met: a) the activity is financed with debt that is secured solely by pledge of the net revenues from fees and charges of the activity; 2) laws or regulations require that the activity's costs of providing services, including capital costs (such as depreciation or debt service), be recovered with fees and charges, rather than with taxes or similar revenues.