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Some aspects of human performance can also be measured by known techniques, using measures such as speed, accuracy, processing time, production rate, error rate, training time to criterion level, or level of job satisfaction. Simple comparisons between humans and equipment in performing a task have to be seen in the context of the associated tasks that are being performed and the total efficiency in job performance. There can be trade-offs that influence the assignment process. System performance levels will be influenced by the ways that the humans and the hardware/software components of the system interact dynamically.
Advances in computer-based devices and in software have modified the previously clear cut boundary which Fitts perceived. 3. Attributes of humans and automation Fitts' concept was to identify various attributes of both humans and technological systems which reflected their differing abilities and capabilities and to express these in the form of standard lists. These lists were then used to classify tasks as to be performed either by man or machine. Numerous examples of such tables can be found throughout the 45 ergonomics literature and by way of example one such list is given in Appendix B.
Operational feedback It is important to regularly examine feedback from operating experience with the system and other related systems to ensure that the original balance remains valid and to identify any need for revisions to the original assignments if operating experience so indicates. 4. RESEARCH MATTERS This section discusses the general situation with respect to research into assignment of functions, the historical antecedents of the current situation and certain developments in design methodologies.