Fitness for purpose

The ability of a technological outcome to serve its intended purpose ("do the job") within its intended context, where the "job to be done" is clearly defined by the brief.

Fitness for purpose in its broadest sense extends the context to the practices involved in the development of the outcome, including such things as the sustainability of resources used, treatment of the people involved in manufacture, ethical nature of testing practices, cultural appropriateness of trialling procedures, determination of life cycle, and ultimate disposal.