Study of Methodologies for Risk Assessment in Operational System Safety

Several methodologies for risk analysis have been developed to manage major industrial risks. All of these developed scientific methodologies represent the discipline of operational system safety. In the industrial activities, it is often difficult to choose and to find the best and the most appropriate methodology for a given situation which allows us to obtain the most complete and benefic results. In this article, 35 methods were identified to be studied that will allow us to choose and eventually develop the most appropriate methodology in a given situation. We found that these methods are either empirical, statistical or both at the same time and in any case they may be either qualitative or quantitative. The review of all input and output data used permits us to divide them into different classes. To understand the usefulness and role of each methodology links were developed between different classes of input data and different types of methodologies, on the one hand, and on the other hand, links between the different classes of output data and methodologies. This work shows the judicious way to choose or develop the methodology for risk analysis the most appropriate depending on the situation to be analyzed, the availability of the basic input data and the type of results needed.