The Role of Randomness of a Manual Assembly Line with Walking Workers on Model Validation

Designing a dynamic system inherent with randomness requires predictable and dependable mathematical models that focused well on variability of the output. In addition, the model should provide an understanding for the impact of that randomness on the model validation as an abstraction for the real system. Lack of this fact causes inaccuracy in the results from the mathematical model, especially when modelling systems with high manual work content such as manual assembly lines with walking worker(s) (WWAL). This paper deals with validation of the mathematical model of WWAL and effect of sources of randomness in the system on worker operating times and in the end on the output of the system.