This is especially evident in phases c and d where

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Unformatted text preview: as inputs. A transition to a new stage entails a major shift in the nature or extent of technical activities. Control gates assess the wisdom of progressing from one stage to another. (See Section 4.8.3 for success criteria for specific reviews.) From the perspective of the system engineer, who must oversee and monitor the technical progress on the system, Figure 8 provides a more complete description of the actual work needed through the NASA project life cycle. In practice, the stages do not always occur sequentially. Unfolding events may invalidate or modify goals and assumptions. This may neccessitate revisiting or modifying the results of a previous stage. The end items comprising the system often have different development schedules and constraints. This is especially evident in Phases C and D where some subsystems may be in final design while others are in fabrication and integration. The products of the technical activities support the systems engineering effort (e.g., requirements and specifications, trade studies, specialty engineering analyses, verification results), and serve as inputs to the various control gates. For a detailed systems engineering product database, database dictionary, and maturity guidelines, see JSC-49040, NASA Systems Engineering Process for Programs and Projects. Several topics suggested by Figures 7 and 8 merit special emphasis. These are concurrent engineering, technology insertion, and the distinction between verification and validation. Concurrent Engineering. If the project passes early control gates prematurely, it is likely to result in a need for significant iteration of requirements and designs late in the development process. One way this can happen is by failing to involve the appropriate technical experts at early stages, thereby resulting in the acceptance of requirements that cannot be met and the selection of design concepts that cannot be built, tested, maintained, and/or operated. Concurrent engineering is the simultaneous consideration of product and process...
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This document was uploaded on 02/26/2014 for the course E 515 at University of Louisiana at Lafayette.

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