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===Systems engineering ===
{{main|Functional flow block diagram}}
Functional decomposition in [[systems engineering]] refers to the process of defining a system in functional terms, then defining lower-level functions and sequencing relationships from these higher level systems functions.<ref>[http://ocw.mit.edu/courses/aeronautics-and-astronautics/16-885j-aircraft-systems-engineering-fall-2005/readings/sefguide_01_01.pdf ''Systems Engineering Fundamentals.''], Defense Acquisition University Press, Fort Belvoir, VA, January 2001, p45</ref> The basic idea is to try to divide a system in such a way that each block of a [[Functional flow block diagram|block diagram]] can be described without an "and" or "or" in the description.
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