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International audienceThis paper aims to develop a system dynamics model in order to formalize causal interdependencies between safety factors (technical, organizational and human). These factors define safety conditions in a complex industrial system. It is a systemic approach founded on the method of system dynamics and the case study is a storage unit for chemical products located in Morocco. System dynamics using VENSIM® software has been applied to assess the safety of the storage unit by modeling the activity of the industrial system. Through simulation, users can define deviant scenarios in order to improve safety of the industrial system and implement managerial tools involving organizational, technical and human factors

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In the context of a world dominated by growing uncertainty, complex sociotechnical systems find themselves confronted with unexpected disruptions, which may lead to significant losses. To cope with these adverse events, modern sociotechnical systems constantly seek out ways of enlarging their ability to absorb and recover from disturbance, a capacity that we call resilience. With the aim of helping systems fulfill this mission, many research works have been conducted to develop methods for measuring, evaluating, and increasing the system's resilience. One of the approaches, which arise from these works, is resilience engineering, a paradigm within which this article proposes a new structure of sociotechnical system processes, characterized by the introduction of resilience processes and their association with the other process categories. To illustrate the new proposed structure, we implemented a metamodel using the systems modeling language. Then, we focused on the resilience process behavior in a crisis through a qualitative and quantitative study accomplished by applying system dynamics approach. This article also develops a scoring system to assess the resilience of sociotechnical system processes and rank them based on the results.

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