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This study deals with the Human Reliability Analysis. A causal methodology is used to report the dynamic responses over time of humans at work. This structure is mounted inside a main framework which includes multi criteria decisions about main and subsidiaries concepts that influence the work-stress and the operations management. Factors and variables from the Human, Team, Work, Environment behavior are considered and declined in constant, measurable and depended elements with inter and intra level connections. Contextualization in a safety based approach is reported as per different tasks in a motor company. Calibration on humans and assembly tasks is reported under a dynamic simulation across levels, auxiliary variables and constants. Critical influencing factors for human reliability at work are identified and modelled.

This paper frames a model which summarizes the principal factors and relationships to incorporate human element, as per fatigue engagement, in the strategic and tactical decision making. A characterization of humans as per a dynamic interferer in system is presented. The findings are tested in an U-shaped assembly division of an international motor company. Dual-Resource Constrained sets are proposed. A Multi Agent model architecture, incorporating system dynamics modelling per humans, is implemented. ANOVA is executed for interaction analyses. Results designed optimal job sequence, rest break and task’s sequence, recovery rate and load characters as per enhanced system’s performances. Stable fatigued conditions are under complete recovery. Production rate in system is affected by fatigue that in turn increases with rise in switching rate. Chaotic market behavior prefers decentralized assignment of worker to task. Continuous switching suffers from learning attitude. Chaotic demand impairs fatigue across workforce reporting instable operator fatigue under different allocation rules. Under loudly physical tasks, random assignment is preferable for productivity outcomes. Autonomous control of workers at work considerably impairs fatigue under complete resting schema.