CFR›Title 48›Chapter 6›Part 615 ContainsSubparts 615.2–615.6CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 615—CONTRACTING BY NEGOTIATION Subparts 615.2 Subpart 615.2—Solicitation and Receipt of Proposals and Information Sections 615.204–615.209-70 615.3 Subpart 615.3—Source Selection Section 615.303 615.4 Subpart 615.4—Contract Pricing Sections 615.404–615.404-4 615.6 Subpart 615.6—Unsolicited Proposals Section 615.604 Authority22 U.S.C. 2651a, 40 U.S.C. 121(c) and 48 CFR chapter 1.Source64 FR 43623, Aug. 11, 1999, unless otherwise noted. Previous 614 Part 614—Sealed Bidding Next 616 Part 616—Types of Contracts