Workload is a measure of the demands imposed by a system on someone’s mental or physical resources.
The ability to predict workload allows us to analyse design concepts without the need for formal trials.
We can then:
Allocate functions rationally between operator and machine
Indicate which tasks impose the highest and lowest workload
Select the system design that optimises workload
Suggest design modifications to optimise workload
Avoid the pitfalls of overloaded or underloaded workers