Section 906.202 - Establishing or maintaining alternative sources(b)(1) Every proposed contract action under the authority of 48 CFR 6.202(a) shall be supported by a determination and finding (D&F) signed by the Senior Procurement Executive.50 FR 12183, Mar. 27, 1985, as amended at 74 FR 36378 , July 22, 2009; 76 FR 7690 , Feb. 11, 2011