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It is usually much more difficult (and much more important) to validate a system than to verify it. Strictly speaking, validation can be accomplished only at the system level, while verification must be accomplished throughout the entire system architectural hierarchy. 8 Funding: The Budget Cycle NASA operates with annual funding from Congress. This funding results, however, from a three-year rolling process of budget formulation, budget enactment, and finally, budget execution. A highly simplified representation of the typical budget cycle is shown in Figure 9.
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. " 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.
Rather, they constitute one of the sources of uncertainty that affect project risks and should be consided in project planning. NASA Systems Engineering Handbook Management Issues in Systems Engineering 4 Management Issues in Systems Engineering This chapter provides more specific information on the systems engineering products and approaches used in the project life cycle just described. These products and approaches are the system engineer's contribution to project management, and are designed to foster structured ways of managing a complex set of activities.