ABSTRACT
From the observed accident cases, scenario-models have been developed, to capture the sequence of events leading to the accident (Bellamy et al. 2007). The scenario-model is the basis for the final logical modelling in the WORM project (Papazoglou 2007). The logical model developed in WORM consists in successive decomposition of the overall accident consequence into simpler and simpler events until a final level of event resolution is achieved. Each level of events is logically interconnected with the more general events of the immediately upper level. The events of the lower level of decomposition form an influence diagram consisting of two parts distinguished by a main event called the Centre Event (CE) and representing the occurrence of an accident (here contact with electricity or an electrical arc). All events to the left of this event represent events aiming at preventing the CE from occurring and the corresponding part of the diagram is called Left Hand Side (LHS). All events to the right of the CE correspond to events aiming at mitigating the consequences of the CE and this part of the model is called Right Hand Side (RHS) (Papazoglou 2007).
