Optional Form (OF) 307, Contract Award, Standard Form (SF) 26, Award/Contract, or SF 33, Solicitation, Offer and Award, may be used to award negotiated contracts in which the signature of both parties on a single document is appropriate. Note however, if using the SF 26 for a negotiated procurement, block 18 is not to be used. If these forms are not used, the award document shall incorporate the agreement and award language from the OF 307.