performance data obtained from HITL experiments conducted for other purposes. Given these circumstances, there is no way to know whether the task times used in the model are at all valid.

Computation of Task Load

The addition of task times to calculate R-side task load may be the simplest approach to computing task load while still being reasonable. However, adding task times does not account for the possibility—and real-world probability—that some tasks are performed concurrently and that the time it takes to performs tasks can change depending on the total task load or the number of controllers working the sector. These tenuous assumptions may or may not be critical to the task load results. Examining their potential impact on task load, however, is important for making a convincing case that the assumptions do not represent serious modeling deficiencies. This case has not been made.



The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement