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A software module that performs a specific action, is invoked by the appearance of its name in an expression, may receive input values, and returns a single value. [ ISO/IEC/IEEE 24765 ]
Function [ IEEE 1233 ]: A task, action, or activity that must be accomplished to achieve a desired outcome.
Function [ IEEE 1320 ]: A transformation of inputs to outputs, by means of some mechanisms, and subject to certain controls, that is identified by a function name and modeled by a box.
Function [ ISO/IEC 26514 ]: Part of an application that provides facilities for users to carry out their tasks.
Function [ ISO/IEC/IEEE 24765 ]: A defined objective or characteristic action of a system or component.