Identify and quantify goals before it is possible to

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Unformatted text preview: esult of this step is the discovery and delineation of the system's goals, which generally express the desires and requirements of the eventual users of the system. In the NASA context, the system's goals should also represent the long term interests of the taxpaying public. Identify and Quantify Goals. Before it is possible to compare the cost-effectiveness of alternative system design concepts, the mission to be performed by the system must be delineated. The goals that are developed should cover all relevant aspects of effectiveness, cost, schedule, and risk, and should be traceable to the goals of the supersystem. To make it easier to choose among alternatives, the goals should be stated in quantifiable, verifiable terms, insofar as that is possible and meaningful to do. It is also desirable to assess the constraints that may apply. Some constraints are imposed by the state of technology at the time of creating or modifying system design concepts. Others may appear to be inviolate, but can be changed by higher levels of management. The assumptions and other relevant information that underlie constraints should always be recorded so that it is possible to estimate the benefits that could be obtained from their relaxation. At each turn of the spiral, higher-level goals are analyzed. The analysis should identify the subordinate enabling goals in a way that makes them traceable to the next higher level. As the systems engineering process continues, these are documented as functional requirements (what must be done to achieve the next-higher-level goals) and as performance requirements (quantitative descriptions of how well the functional requirements must be done). A clear operations concept often helps to focus the requirements analysis so that both functional and performance requirements are ultimately related to the original need or opportunity. In later turns of the spiral, further elaborations may become documented as detailed functional and performance specifications. Create Alternative Design Concepts....
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