
208 Human Factors of a Global Society
as a member of algorithm (mode of performance of some elements of task), cognitive and behavioral
actions, and operations that are elements of the member of the algorithm. Figure 19.1 depicts the
time structure of one member of the algorithm, when a subject, after grasping two pins, moves them
simultaneously into the holes when one pin is uted. This requires decision making on how to turn
the pin with the ute. In Figure 19.1, the horizontal segments index the duration of the various ele-
ments of activity. The length of the segments in the model reects the duration of elements of activ-
ity (duration of ...