Security system management has been very interested in human cognition in order to control risks and enhance security rate in high level risk firms. “Situation awareness” (SA) models have been widely explored to explain and predict, generally according to qualitative methods, individual’s decision making in complex environment.
In the first part of this paper, we suggest an ergonomic model based on a review of Endsley’s SA model that we name "action’s determinants". We highlight Ergonomic factors as anthropometric features, vigilance degree, skills and workload to propose a tree blocs model of dynamic decision making. The objective of this study is to identify and model the elements that lead to a way of making of an operator exerting in complex security system.
In the second part, an application of the model will be made according to the fuzzy intuitionistic dynamic multi-attribute decision making design method. The mathematical model, based on fuzzy sets and multi-criteria design methods, reinforce the real-world applicability and measurement of the ergonomic proposed model. This application of the model gives a tangible and numeric decision support system in choosing the adequate human resources to operate in a definite critical system.
Finally, a practical case of application in railway will be detailed to illustrate the application and measurement of the model.

Action determinants, Situation awareness, Dynamic intuitionistic fuzzy multi-attribute decision making (DIF-MADM), ergonomics, railway security system.