According to the PMBOK® Guide, a Cost Plus Incentive Fee (CPIF) contract is a type of cost-reimbursable contract where the buyer pays the seller for allowable costs (as defined in the contract) and the seller earns a fee if they meet defined performance criteria.

Mechanics of CPIF:

Cost Reimbursement: The seller is paid for all legitimate costs incurred.

Incentive Fee: A predetermined fee is tied to achieving specific performance objectives, such as cost savings, schedule milestones, or technical targets.

Sharing Ratio: In many CPIF contracts, if the final costs are less than or greater than the original estimated costs, both the buyer and seller share the departures from the target costs based upon a pre-negotiated sharing formula (e.g., an 80/20 split).

Risk Allocation: In this contract type, the risk is primarily with the buyer, as they must pay all costs. However, the incentive fee motivates the seller to manage costs and performance efficiently to increase their own profit.

Analysis of Other Options:

B. Cost Plus Fixed Fee Contract (CPFF): The seller is reimbursed for allowable costs and receives a fixed fee payment calculated as a percentage of the initial estimated project costs. The fee does not change based on performance or actual costs.

C. Fixed Price Incentive Fee Contract (FPIF): The buyer pays a set price (fixed price), and the seller can earn an additional financial incentive for hitting certain metrics. Unlike the CPIF, the base costs are not reimbursed; they are part of the fixed price.

D. Time and Material Contract (TandM): These are hybrid arrangements that contain aspects of both cost-reimbursable and fixed-price contracts. They are often used for staff augmentation or when a precise statement of work cannot be quickly prescribed.