Fit(ness) for purpose

The ability of a technological outcome to serve its intended purpose ('doing 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 sustainability of resources used, treatment of people involved in the manufacture, ethical nature of testing practices, cultural appropriateness of trialling procedures, determination of life cycle and ultimate disposal etc.