Definition: The input/output requirement for a system to be designed consists of specifications of (i) the length of the operational life of the system to be designed, that is, the length of the operations phase of the system life cycle: see 1.53 and 1.105 (this sets a standard time scale for all input and output trajectories), (ii) the set of inputs to be accepted by the system to be designed, (iii) the set of input trajectories or histories which the system to be designed might experience, (iv) the set of outputs producible by the system to be designed, (v) the set of output
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