Invitation for Bid is the preferred method of procurement; however, invitation for bid is not always practical and advantageous and in certain situations described in this chapter other methods of procurement, such as request for proposal, may be used. (Ord. 14-44 § 2, 2014; Ord. 99-119 § 2, 1999; Ord. 95-15 § 2, 1995; Ord. 88-155 § 1, 1988.)