“Each sent pressure can be regarded as arousing in the focal person a psychological force of some magnitude and direction. Such forces will be called role forces. This is not to say that these motivational role forces are identical in magnitude and direction with the role pressures which evoked them. Especially when role pressures are seen as illegitimate or coercive, they may arouse strong resistance forces which lead to outcomes different from or even opposite to the expected behavior. Pressures to increase production rates sometimes result in slowdowns. Moreover, every person is subject to a variety of psychological forces in addition to those stimulated by pressures from his role set in the work situation. Role pressures are thus only a partial determinant of behavior on the job. In addition, to the motivational forces aroused by role pressures, there are important internal sources of motivation for role performance. One of these stems from the intrinsic satisfaction derived from the content of the role.”

Source: Organizational stress: Studies in role conflict and ambiguity, 1964, p. 16-17