As system designs and operational concepts mature

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Unformatted text preview: design toward an optimum. The basic steps in that process are: • • • • • Understand what the system's goals, objectives, and constraints are, and what the system must do to meet them—that is, understand the functional requirements in the operating environment. Devise some alternative means to meet the functional requirements. In the early phases of the project life cycle, this means focusing on system architectures; in later phases, emphasis is given to system designs. Evaluate these alternatives in terms of the outcome variables (system effectiveness, its underlying performance or technical attributes, and system cost). Mathematical models are useful in this step not only for forcing recognition of the relationships among the outcome variables, but also for helping to determine what the performance requirements must be quantitatively. Rank the alternatives according to an appropriate selection rule. Drop less-promising alternatives and proceed to next level of resolution, if needed. This process cannot be done as an isolated activity. To make it work effectively, individuals with different skills—system engineers, design engineers, specialty engineers, program analysts, decision scientists, and project managers—must cooperate. The right quantitative methods and selection rule must be used. Trade study assumptions, models, and results must be documented as part of the project archives. 5.2 Cost Definition and Modeling This section deals with the role of costs in the systems analysis and engineering process, how to measure it, how to control it, and how to obtain estimates of it. The reason costs and their estimates are of great importance in systems engineering goes back to the principal objective of systems engineering: fulfilling the system's goals in the most cost-effective manner. The cost of each alternative should be one of the most important outcome variables in trade studies performed during the systems engineering process. One role, then, for cost estimates is in helping to choose r...
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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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