Consequence analysis of human unreliability during railway traffic control

摘要

The paper presents a descriptive method to analyse consequences of human unreliability. Unreliability is seen as combining three behavioural factors: acquisition related failure, problem solving related failure, and action related failure. The method is divided into four steps: the functional analyses, the context identification, the task state identification and the consequence analysis of the human unreliability. The functional analysis step aims at determining interactions between the required control process functions and the human tasks. The context identification step lists the required procedures with regard to different work supports and conditions. The task state identification identifies the unreliable tasks which can be due to an acquisition related failure, e.g. data sensor failure, and/or a problem solving related failure, e.g.erroneous processing of information or/and processing of erroneous information, and/or an action related failure, e.g. an unrequired performed action or an omission. Finally, the consequence analysis step identifies catastrophic scenarios due to human behaviour. The whole methodological approach is applied on a practical example: the railway system, and more precisely the railway traffic control system.