According to the PMBOK Guide, 6th edition, section 12.3.3.1, procurement agreements are legal documents that define the contractual relationship between the buyer and the seller. They include terms and conditions, scope of work, pricing, payment schedule, delivery dates, and other clauses that govern the procurement process. If the vendor is unable to deliver some of the equipment at the agreed dates, the project manager should review the procurement agreements to determine the impact of the delay on the project scope, schedule, cost, quality, and risk. The project manager should also communicate with the vendor to understand the root cause of the delay and negotiate possible solutions or alternatives. Depending on the severity of the delay and the clauses in the procurement agreements, the project manager may also invoke penalties, incentives, or termination options to protect the interests of the project. References: PMBOK Guide, 6th edition, section 12.3.3.1; PMI website