Abstract
An operational model was developed for a series of five tasks and four job performance aids. The tasks were defined by both speed and accuracy constraints. Each aid was described in terms of its efficacy on task performance, i.e., time and errors. The developed model was transcribed into SAINT in order to simulate and to compare different combinations of each task's speed and accuracy constraints under various levels of speed stress. Mean task time was found to be a function of task constraints and the JPAs matched to those constraints. Performance time was found to decrease when JPAs were reassigned if initial JPA assignments failed an evaluation criterion test. Performance time continued to decrease when a state of organizing stress was induced by reducing the overall available task time to perform the task series. The continued reduction of the overall available time reached a point at which the stress became disorganizing and caused mean task time to increase.
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