Which phase is NOT part of procurement processes that use competitive bidding mechanisms?

The purchase and procurement phase is specifically associated with the actual acquisition of goods or services following the selection of a bid. This phase typically comes after the competitive bidding process, where vendors are evaluated, and a contract is awarded. In contrast, the solicitation and presolicitation phases focus on creating and issuing the bid documents and preparing the market to receive proposals, while the post-award and administration phase deals with managing and fulfilling the contract once it has been awarded.

Thus, the purchase and procurement phase stands out as it encompasses the activities that occur after the competitive bidding has concluded, rather than being a part of the procurement processes that use competitive bidding mechanisms. This distinction is critical for understanding the flow of procurement operations and the role of each phase in the overall process.