The practices of systems engineering are believed to have high value in therndevelopment of complex systems. Heuristic wisdom is that an increase in the quantity andrnquality of systems engineering (SE) can reduce project schedule while increasing productrnquality. This paper explores recent theoretical and statistical information concerning thisrnheuristic value of SE. It explores the underlying theoretical relationships among project cost andrnschedule, technical value, technical size, technical complexity, and technical quality,rnsummarizing prior work by the author. It then identifies and summarizes six prior statisticalrnstudies with conclusions that relate to the value of SE. Finally, the paper provides final results ofrna statistical study by the INCOSE Systems Engineering Center of Excellence (SECOE) thatrnpresents evident correlations supporting the heuristics. The results indicate that optimal SErneffort is approximately 15-20% of the total project effort.
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