Direct costs means costs that can be identified readily with activities carried out in support of a particular final objective. A cost may not be allocated to an award as a direct cost if any other cost incurred for the same purpose in like circumstances has been assigned to an award as an indirect cost. Because of the diverse characteristics and accounting practices of different organizations, it is not possible to specify the types of costs which may be classified as direct costs in all situations. However, typical direct costs could include salaries of personnel working on the TIP project, travel, equipment, materials and supplies, subcontracts, and other costs not categorized in the preceding examples. NIST shall determine the allowability of direct costs in accordance with applicable Federal cost principles.