This paper discusses the state of the art in the reliability analysis of human operators. Such analyses generally comprise human reliability assessment (HRA) in Man-Machine Systems (MMS) and involve the description of available human behaviour models. In the given context, man-machine systems represent the actual interaction between a human operator and a technical system. The authors introduce systems where the human factor plays an essential role and the failure of a human being could lead to a safety hazard. Currently, the quantitative evaluation of human reliability is based on the total probabilistic safety analysis (PSA) of the entire MMS.

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