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Goods & Services Non-Professional (ITB)
Code of Alabama, § 41-16-20 - When required
All contracts of whatever nature for labor, services, work, or for the purchase or lease of materials, equipment, supplies, or other personal property, involving fifteen thousand dollars ($15,000) or more, made by or on behalf of any state department, board, bureau, commission, committee, institution, corporation, authority, or office shall, except as otherwise provided in this article be let by free and open competitive bidding, on sealed bids, to the lowest responsible bidder.

Professional Services (RFP)
Code of Alabama, § 41-16-72 (4)
The Director of Finance, through the Division of Purchasing of the Department of Finance, shall establish and maintain lists those specifically named in this section, which may be required from time to time by any state agency, department, board, bureau, commission, authority, public corporation, or instrumentality. When such professional services are needed, the purchasing state entity shall solicit proposals from the professional service providers desiring to receive requests for proposals. The purchasing state entity shall select the professional service provider that best meets the needs of the purchasing entity as expressed in the request for proposals. Price shall be taken into consideration. In the event the fees paid to the selected professional service provider exceed by 10 percent the professional service fee offered by the lowest qualified proposal, the reasons for selecting a professional service provider must be stated in writing, signed by the director of the purchasing state entity, and made a part of the selection record.

Architects/Engineers (RFQ)
Code of Alabama, § 41-16-72 (3)
Professional services of architects, landscape architects, engineers, land surveyors, geoscience, and other similar professionals shall be procured in accordance with competitive, qualification-based selection policies and procedures. Selection shall be based on factors to be developed by the procuring state entity which may include, among others, the following: ...