“…Since human workload, in most situations, acts as a stressor, it is assumed to be proportional to arousal 19 . Consequently, perfect automation design permits operators to compensate for conditions, including workload redlines, that is, task overload or underload, and extended working hours which may all eventually result in increased fatigue and an augmented risk of performance decrements 20,21 . Certainly, the type of functions which can be skill‐, rule‐ or knowledge‐based 22 plays an important role in the level of human workload.…”