„Constructs extraneous to the real world should be eliminated from the analysis model. They may be needed later during design, but not now. For example, CPU subroutine, process, algorithm, and interrupt are implementation constructs for most applications [and should be excluded from the analysis model]...“

—  Рамбо, Джеймс, p. 155; as cited in: Roger Chiang et al (2009, p. 165)
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