On the structure of working behaviour
Changes in the application of working methods as a result of protective and adaptive control of fatigue have been documented in a number of studies (e.g. Teiger, 1978; Sperandio, 1972; Hacker and Vaic, 1973). These studies indicate that structural changes in working behaviour can be determined by observing task performance in its natural environment. Furthermore, the results show that individuals are capable of regulating performance when getting fatigued, favouring more uniform and less demanding working methods in those situations (see also Jongman, chapter 33 in this volume). The extent to which a person can adapt and regulate his/her working behaviour will depend strongly on the restrictions of the workplace. It can be expected that a workplace with many constraints lead to more uniform action patterns.