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A functional approach to specifying the requirements of a computer system is discussed. The method allows system requirements to be documented, whether the system is implemented using a computer and peripheral devices, or, for example, relays and analog components. The method is a refinement of the method used in the A-7 aircraft software requirements model document. The approach is illustrated with examples derived from a software requirements document for a water level monitoring system.>
Schouwen et al. (Mon,) studied this question.