Reliability in the choice of technology

The first essential is that the specification is fully defined, for on this the success of the project depends. This done, the reliability or ‘operational security’ of each possible technology must be investigated, so as to make possible the optimum choice. The term operational security (OS), which is coming more and more into use, means more than reliability and is understood as including reliability — ability to work without failure maintainability — ability to be restored quickly to working condition after failure availability — being in working condition when required security — remaining safe in case of failure