Understand cognitive styles. The text authors see personality as relatively stable. Text authors recognize large gap between individual differences and Individual and organizational outcomes. See p. 274, and Fig. The situation brings forth personality traits.
Personality is the interactive result of the person and the situation.
There is consistency in the way people react to the same situation. You act because you have learned a set of roles that are appropriate to particular situations. You learned because you succeeded with them in the past. Often the same actions pay off in the same way given the same situation. Further, you get to choose situations.