This presentation will offer a discussion of how to define, capture, and manage requirements and changes to requirements, how requirements are decomposed (allocated) into lower level requirements and how they are allocated to product design elements (such as product models, software modules,and CAD features, etc.) Tools and processes that are used to track and validate requirements against relevant design information as the design progresses will be described. Particular emphasis will include approaches to, and value of, end-to-end traceablity.