In particular, the role of experts in problem structuring and in developing failure mitigation options is much more prominent, and there is a need to take into account the reliability potential for future mitigation measures downstream in the system life cycle. This leads to features of the expert judgement problem in the design context which are substantially different from those seen, for example, in risk assessment. It is argued that, as far as meeting reliability requirements is concerned, the whole design process is more akin to a statistical control process than to a straightforward statistical problem of assessing an unknown distribution. Generic design processes are described to give the context and a discussion is given about the nature of the reliability assessments required in the different systems engineering phases. This paper reviews the role of expert judgement to support reliability assessments within the systems engineering design process.
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