How allowable and allocable travel for an external party (regardless of whether their salary is paid or not paid on the project) is purchased and paid for is at the discretion of the CU department and project needs. Travel costs for an external party can be paid for directly by CU or paid for by the external party and reimbursed through PSC or a subaward, dependent on subaward or vendor determination, and as it works best for the project and the CU department. In all cases, travel must be allowable and allocable and follow relevant travel policies and regulations.