Safety studies in dependability modelling are hardly compatible with human factor. Under the project \textsc{spica-rail} and on the basis of the method Functional Resonance Accident Model (\textsc{fram}) developed by Hollnagel \cite{Hol03}, this article argues that it is possible to use this technique in addition to traditional safety techniques in order to establish a common reference between human factors and dependability specialities. A practical example is proposed in the field of train traffic supervision.