A. Allowable cost. Standards for allowability of costs are established by Federal Management Circular 74-4. These standards will apply regardless of whether a particular item of cost is treated as direct or indirect. Failure to mention a particular item of cost in these standards is not intended to imply that it is either allowable or unallowable. Rather, determination of allowability in each case should be based on the treatment of standards provided for similar or related items of cost. The allowability of the selected items of cost is subject to the general policies and principles as stated in Attachment A to Federal Management Circular 74-4.