RESILIENCE ENGINEERING: A RESTRUCTURING OF PROCESSES TOWARD THE BUILDING OF RESILIENT SOCIOTECHNICAL SYSTEMS

The complexity of sociotechnical systems and the uncertainty of their environment foster the multitude of disturbances affecting the functioning of the system. These disturbances can cause an interruption of the activity and may result in losses of multiple nature. In order to avoid such a situation, a new structure of sociotechnical systems integrating resilience processes as a key category of processes was proposed. In the meta-model that was built using the UML language, the role played by resilience processes in maintaining resources availability was highlighted. To better understand this role, system dynamics modeling has been adopted. Using the causal diagram that has been drawn up, three pillars of a resilience process, namely resistance, recovery and anticipation were highlighted. The notion of resilience as a capacity has also been introduced. The improvement of this latter is linked to the effectiveness of the intervention of the associated resilience processes. A classification of processes according to their association with well-established resilience processes was also proposed. It is a five-step resilience scale. Then, the quantitative aspect was studied by drawing up a stock-flow diagram. Finally, this model has been run based on a practical case. From this simulation, interesting conclusions were drawn.