The purchase plan is prepared to determine what and when to purchase.

Manage contract related changes and contractual relationships with project customers.

Contract closure, contract performance and liquidation, including decisions on some outstanding projects. During the life cycle of a contract, the buyer is first regarded as a bidder, then the selected supplier, and finally the contracted supplier. 13.1 definition of project procurement and contract management: procurement is a complete procurement process for obtaining products and services from outside the project.