ABSTRACT
This chapter explores on mental workload (MWL) measures for work evaluation to assess levels of mental load imposed by a system. MWL is an area of study within cognitive ergonomics. MWL measures can offer awareness as to where increased task demands could lead to an adverse influence on human performance. It discusses two subjective MWL methods: the National Aeronautics and Space Administration Task Load Index (NASA-TLX) and Workload profile (WP). MWL can be measured by monitoring an operator's performance and observing how it varies with changes in task demands. There are various MWL measures that can be used to confirm workload levels imposed by the system. These MWL measures are often used to verify whether the human is operating within a tolerable information-processing capacity while executing task functions and elements. The use of physiological measures as an indicator of MWL is based on the assumption that as task demand increases, changes in various participant physical responses are noticeable.
