NASA Systems Engineering Handbook [SP-2007-6105] by PDF

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Example text

Transition may involve crating and shipment, transmitting over a network, or hand carrying over to the next lab. Whatever is appropriate, each model for the bottom-level product is prepared and handed to the next level up for further integration. Second Pass Now that all the models (phase products) for the bottomlevel end products are realized, verified, validated, and transitioned, it is time 10 1 to start integrating them 9 11 2 12 7 into the next higher level 13 8 14 3 15 product. For example, for 4 5 6 16 the external tank, realized 17 tier 4 models for product Aba and Abb are integrated to form the model for the tier 3 product Ab.

Once the system meets the stakeholder expectations, the study team baselines the products and prepares for the next phase. Often, intermediate levels of decomposition are validated as part of the process. In the next level of decomposition, the baselined derived (and allocated) requirements become the set of high-level requirements for the decomposed elements and the process begins again. These system design processes are primarily applied in Pre-Phase A and continue through Phase C. The system design processes during Pre-Phase A focus on producing a feasible design that will lead to Formulation approval.

Distributions associated with risky designs may have significant probabilities of producing highly undesirable outcomes, as is suggested by the presence of an additional low-effectiveness/high-cost cloud for concept C. (Of course, the envelope of such clouds cannot be a sharp line such as is shown in the figure, but must itself be rather fuzzy. ) Effectiveness Both effectiveness and cost may require several descriptors. Even the Echo balloons (circa 1960), in addition to their primary mission as communications satellites, obtained scientific data on the electromagnetic environment and atmospheric drag.

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