the left side of the core of the vee is similar to

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Unformatted text preview: igure refer to the hardware and software configuration items, which are controlled by the configuration management system.) Decomposition and Definition. Although not shown in Figure 7, each box in the vee represents a number of parallel boxes suggesting that there may be many subsystems that make up the system at that level of decomposition. For the top left box, the various parallel boxes represent the alternative design concepts that are initially evaluated. As product development progresses, a series of baselines is progressively established, each of which is put under formal configuration management at the time it is approved. Among the fundamental purposes of configuration management is to prevent requirements from "creeping." The left side of the core of the vee is similar to the so-called "waterfall" or "requirements-driven design" model of the product development process. The control gates define significant decision points in the process. Work should not progress beyond a decision point until the project manager is ready to publish and control the documents containing the decisions that have been agreed upon at that point. However, there is no prohibition against doing detailed work early in the process. In fact, detailed hardware NASA Systems Engineering Handbook The Project Life Cycle for Major NASA Systems and/or software models may be required at the very earliest stages to clarify user needs or to establish credibility for the claim of feasibility. Early application of involved technical and support disciplines is an essential part of this process; this is in fact implementation of concurrent engineering. At each level of the vee, systems engineering activities include off-core processes: system design, advanced technology development, trade studies, risk management, specialty engineering analysis and modeling. This is shown on the chart as an orthagonal process in Figure 7(b). These activities are performed at each level and may be repeated many times within a phase. While many kinds of studies and decisions are associated with the off-core activities, only decisions at the core level are...
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