Even if an individual work result becomes a trigger and the accident resulting from human error occurs, the problems of the organization, i.e.; system and climate for safety are considered to exist as the background of accidents resulting from human error. According, in order to prevent human error, systematic management is required. Therefore, we developed human factor analytical technique to pursue the root cause of human error. We report the present situation of the human factor anaysis in railway-related companies and the outline of the analyzing technique. This technique has three step procedures. In each step, we can carry out analysis from many viewpoints by reference of human factor model and PDCA cycle.

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