48 C.F.R. § 9904.418-50
(a) Determination of direct cost and indirect cost.
(2) In accounting for direct costs a business unit shall use actual costs, except that—
(ii) An average cost or pre-established rate for labor may be used provided that:
(B) The functions performed are materially disparate but the employees involved either all work in a single production unit yielding homogeneous outputs, or perform their respective functions as an integral team.
Whenever average cost or pre-established rates for labor are used, the variances, if material, shall be disposed of at least annually by allocation to cost objectives in proportion to the costs previously allocated to these cost objectives.
(b) Homogeneous indirect cost pools.
(d) Allocation measures for an indirect cost pool which includes a material amount of the costs of management or supervision of activities involving direct labor or direct material costs.
(2) The base used to represent the activity being managed or supervised shall be determined by the application of the criteria below. All significant elements of the selected base shall be included.
(3) Indirect cost pools which include material amounts of the costs of management or supervision of activities involving direct labor or direct material costs shall be allocated to:
(e) Allocation measures for indirect cost pools that do not include material amounts of the costs of management or supervision of activities involving direct labor or direct material costs. Homogeneous indirect cost pools of this type have a direct and definitive relationship between the activities in the pool and benefiting cost objectives. The pooled costs shall be allocated using an appropriate measure of resource consumption. This determination shall be made in accordance with the following criteria taking into consideration the individual circumstances:
(2)
(4) Allocation of indirect cost pools which benefit one another may be accomplished by use of:
(g) Use of preestablished rates for indirect costs.