This paper describes experiences using Safety Requirements Engineering (SRE) to reduce the risk of systems not achieving safety certification and not working safely in the intended environment. Industry is creating ever-larger systems with increasing complexity. Applying traditional process-based safety assurance has become unwieldy and uneconomic. In this paper we describe some practical techniques we use for SRE to support rigorous product-based assurance. The aim is to provide detailed safety requirements to guide the choice of design, architecture and development processes, thus managing assurance more effectively. We describe an overview of the approach with specific emphasis in the second part of the paper on accident and hazard identification, illustrated with some examples from previous projects.
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