Abstract
Safety critical systems contain advanced computer, microprocessor and software technologies to a degree of sophistication that is frequently beyond the understanding of many practising engineers. Many of these systems control the safe operation of everyday things such as anti-lock braking on cars, personnel lifts and trains, as well as industrial processes and fly-by-wire aircraft. This paper describes the nature, processes, standards and assessment methods currently being employed with safety critical systems, and addresses various questions that the practising engineer may ask. It demonstrates that although the technology and methods may he novel, concerns surrounding the evaluation of safety critical systems are yet another instance of the age-old dilemma involved in exercising engineering judgement.
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