Requirements reuse provides organizations, with the unique ability to share a requirement across projects without absorbing unnecessary duplication of artifacts within a repository. This is a critical capability that accelerates time to market and cuts development costs. Shared requirements may be read-only in cases where the requirement may not be changed such as regulatory requirements, or varied by each product version as necessary. This white paper discusses the elements that make up a requirement and establishes common understanding of how requirements evolve, and how organizations can reuse requirements to speed product innovation, reduce complexity and control costs.