48 C.F.R. § 215.404-4
(b) Policy.
(1) Contracting officers shall use a structured approach for developing a prenegotiation profit or fee objective on any negotiated contract action when certified cost or pricing data is obtained, except for cost-plus-award-fee contracts (see 215.404-74, 216.405-2, and FAR 16.405-2) or contracts with Federally Funded Research and Development Centers (FFRDCs) (see 215.404-75). There are three structured approaches—
(c) Contracting officer responsibilities.
(2) When using a structured approach, the contracting officer—
(C) May use an alternate structured approach (see 215.404-73) when—
(1) The contract action is—
(i) At or below the certified cost or pricing data threshold (see FAR 15.403-4(a)(1));
(ii) For architect-engineer or construction work;
(iii) Primarily for delivery of material from subcontractors; or
(iv) A termination settlement; or
(2) The weighted guidelines method does not produce a reasonable overall profit objective and the head of the contracting activity approves use of the alternate approach in writing.
(5) Although specific agreement on the applied weights or values for individual profit factors shall not be attempted, the contracting officer may encourage the contractor to—
[63 FR 55040, Oct. 14, 1998, as amended at 63 FR 63799, Nov. 17, 1998; 65 FR 77829, Dec. 13, 2000; 66 FR 49863, Oct. 1, 2001; 71 FR 69494, Dec. 1, 2006; 77 FR 76940, Dec. 31, 2012]