Contract reviews are required by ISO 9001 and involve reviewing proposals and contracts in multiple stages. The stages include reviewing proposals before submission to customers and reviewing contracts before signing. The objectives are to ensure customer requirements are clarified, risks are identified, and no unclarified issues remain. Contract reviews should be implemented based on factors like a project's magnitude, complexity, and organizational complexity. Major proposals may require appointing a review team leader and scheduling reviews to manage workload and responsibilities. Internal projects also require reviews to define requirements, estimates, timelines, and manage risks.