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Systems engineering is concerned with the synthesis and analysis of systems of men and machines having specified objectives. Such performance objectives are commonly expressed in terms of human values and, as a consequence, are often necessarily subjective. Furthermore, the systems under consideration invariably exploit the interaction of men with physical components. It is this high degree of human involvement which particularly distinguishes systems engineering from the more conventional fields of engineering. Thus, the design and analysis of a message handling information system is a systems engineering activity, whereas the design and evaluation of a water pump falls within conventional practice
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