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An activity, process, or transformation stated by a verb and a noun that describes what must be accomplished.

A function is an intended effect of an item and should be described such that each function has a single definite purpose. It is recommended to give the functions names that have a declarative structure, and say “what” is to be done rather than “how.” The functions should preferably be expressed as a statement comprising a verb plus a noun; for example, provide light, close flow, contain fluid, pump fluid, and transmit signal. In practice, it is often difficult to specify a function with only two words, and additional words may need to be added.