This 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.