Editing Workload (section)

=== Creating a model ===
With any attempt at creating a workload model, the process begins with understanding the tasks to be modelled. This is done by creating a task analysis that defines:
* The sequence of tasks performed by individuals and team members.
* The timing and workload information associated with each task.
* Background scenario information.

Each task must be defined to a sufficient level to allow realistic physical and mental workload values to be estimated and to determine which resources (or combination of resources) are required for each task – visual, auditory, cognitive and psychomotor. A numerical value can be assigned to each based on the scales developed by McCracken and Aldrich.

These numerical values against each resource type are then entered into the workload model. The model sums the workload ratings within each resource and across concurrent tasks. The critical points within the task are therefore identified. When proposals are made for introducing new devices onto the current baseline activities, this impact can then be compared to the baseline.
One of the most advanced workload models was possibly developed by K Tara Smith (2007). This model integrated the theories of Wickens, McCracken and Aldrich and Hopkins to produce a model that not only predicts the workload for an individual task but also indicates how that workload may change given the experience and training level of the individuals carrying out that task.
Workload assessment techniques are typically used to answer the following types of questions: Eisen, P.S and Hendy, K.C. (1987):
* Does the operator have the capability to perform the required tasks?
* Does the operator have enough spare capacity to take on additional tasks?
* Does the operator have enough spare capacity to cope with emergencies?
* Can the task or equipment be altered to increase spare capacity?
* Can the task or equipment be altered to increase/decrease the amount of mental workload?
* How does the workload of a new system compare to the old system?