An incremental review process for verification of requirements associated with spacecraft is described. Rather than wait for a final, cumulative top-down systems-level review to verify all requirements prior to pre-shipment of a spacecraft, a process has been developed that incrementally verifies requirements at multiple levels of allocation and builds a cumulative collection of verification data products. By reviewing and verifying requirements as early as possible, risks associated with verification are exposed and retired throughout design development and into early integration and test. Verification products such as detailed analyses and end item data packages are generated by the technical experts supporting the spacecraft development effort and are assessed against pertinent requirements to ensure their completeness for verification documentation purposes. The products submitted and approved for verification are tracked and stored in common access areas online to enable verification efforts to proceed across a flight program at multiple levels — subsystems, spacecraft, space segment and system — simultaneously. Thus, changes in personnel and staffing levels during the life of a flight program are managed by enabling assessment expertise to assess verification materials as soon as they are available — instead of waiting potentially for years to be reviewed and perhaps impacting spacecraft shipment and the launch schedule. Details of the Incremental Verification Review (IVR) process are discussed and application of the process to a flight program is presented.

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