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Need or expectation that is stated, generally implied or obligatory (IEV 192‐01‐13).

A performance requirement is a specification of the performance criteria related to a function. If, for example, the function is “pump water,” a performance requirement may be that the output of water must be between 100 and 110 l/min. Some functions may have several performance requirements. Performance requirements are also referred to as functional requirements or performance standards.