48 CFR § 873.116 - Source selection decision.
(a) An integrated comparative assessment of proposals should be performed before source selection is made. The contracting officer shall independently determine which proposal(s) represents the best value, consistent with the evaluation information or factors and subfactors in the solicitation, and that the prices are fair and reasonable. The contracting officer may determine that all proposals should be rejected if it is in the best interest of the Government. (38 U.S.C. 8153)
(b) The source selection team, or advisory boards or panels, may conduct comparative analysis(es) of proposals and make award recommendations, if the contracting officer requests such assistance. (38 U.S.C. 8153)
(c) The source selection decision must be documented in accordance with FAR 15.308.