In addition the systems requirements are assessed to

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Unformatted text preview: plinary PDTs (which may mirror and work with those of a system contractor) can use CALS technology to speed the exchange of and access to data among PDTs. Availability of data through CALS on parts and suppliers also permits improved parts selection and acquisition. (See Section 3.7.2 for more on concurrent engineering.) Configuration control also benefits from CALS technology. Using CALS to submit, process, and track ECRs/ECPs can reduce delays in approving or rejecting them, along with the indirect costs that delays cause. Although concurrent engineering is expected to reduce the number of ECRs/ECPs during design and development (Phases C and D), their timely disposition can produce significant cost savings. (See Section 4.7.2 for more on configuration control.) Lastly, CALS technology potentially enables ILS functions such as supply support to be performed simultaneously and with less manual effort than at present. For example, procurement of design-stable components and spares can begin earlier (to allow earlier testing); at the same time, provisioning for other components can be further deferred (until design stability is achieved), thus reducing the risk of costly mistakes. Faster vendor response time also means reduced spares inventories during operations. 6.6 Verification Verification is the process of confirming that deliverable ground and flight hardware and software are in compliance with functional, performance, and design requirements. The verification process, which includes planning, requirements definition, and compliance activities, begins early and continues throughout the project life cycle. These activities are an integral part of the systems engineering process. At each stage of the process, the system engineer's job is to understand and assess verification results, and to lead in the resolution of any anomolies. This section describes a generic NASA verification process that begins with a verification program concept and continues through operational and dispo...
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