Currently there are five systems engineering standards in various stages of release and three systems engineering capability models. This makes it difficult to know what to use as a basis for process improvement. This paper discusses the similarities and differences among the standards and models. The standards have been evolving from the U.S. Military to international and commercial, with recent standards taking a broader scope. Two capability maturity models have been merged into a third, which is tied to the standards.
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Sheard et al. (1998) studied this question.
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