Abstract
When we evaluate the human-machine-environment systems, it is very important to consider not only the performance of the machine system but also the Mental Work Load (MWL) for the operator. Because human being have a high adaptability to their surroundings. It is difficult to measure the MWL directly. From this point of view, many researches on the vital reaction related MWL have been done in recent years. However, the evaluation method has not been established yet. In this study, we construct the MWL evaluation model using the Heart Rate Variability (HRV), because a strong relation exists between the MWL and the HRV. It is examined that the analytical method using this model can be to presume the facor of the MWL for drivers.
