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6 this is accomplished by conducting a rigorous

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Unformatted text preview: n) to the software verification program. IV&V is a process whereby the products of the software development life cycle are independently reviewed, verified, and validated by an organization that is neither the developer nor the acquirer of the software. The IV&V agent should have no stake in the success or failure of the software; the agent’s only interest should be to make sure that the software is thoroughly tested against its requirements. IV&V activities duplicate the project’s V&V activities step-by-step during the life cycle, with the exception that the IV&V agent does no informal testing. If IV&V is employed, formal acceptance testing may be done only once, by the IV&V agent. In this case, the developer formally demonstrates that the software is ready for acceptance testing. Operational and Disposal Verification Operational verification provides the assurance that the system functions properly in a (near-) zero gravity and vacuum environment. These verifications are performed through system activation and operation, rather than through a verification activity. Systems that are assembled on-orbit must have each interface verified, and must function properly during end-to-end testing. Mechanical interfaces that provide fluid and gas flow must be verified to ensure no leakage occurs, and that pressures and flow rates are within specification. Environmental systems must be verified. The requirements for all operational verification activities are defined in the VRSD. Disposal verification provides the assurance that the safe deactivation and disposal of all system products and processes has occurred. The disposal stage begins in Phase E at the appropriate time (i.e., either as scheduled, or earlier in the event of premature failure or accident), and concludes when all mission data have been acquired and verifications necessary to establish compliance with disposal requirements are finished. Both operational and disposal verification activities may also include validation assess- NASA Systems Engineering Handbook Integrating Engineering Sp...
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