This document discusses different types of contracts used in project management. It describes contracts as legal agreements between two or more parties. There are two main types of contracts: fixed-price contracts, used when requirements are well-defined, and cost-reimbursable contracts, best used when the scope is expected to change. Specific contract types are then defined, including firm fixed price, fixed price incentive fee, and cost plus fixed fee contracts. Time and materials contracts are also discussed as a hybrid approach.