Subjects were four groups of 12 college women, high or low in motive to avoid success (MAS) and locus of control (LC), were reinforced for response A on a fixed partial reinforcement schedule on three concept learning tasks, one task consisting of combined reward and punishment, another of reward only, and one of punishment only. Response B was never reinforced, and its frequency constituted the reinforcement avoidance score. High MAS, internal LC subjects avoided reward more than punishment, and high MAS, external LC subjects avoided punishment more than reward. In high MAS subjects, internal LC appears to increase, and external LC to decrease, success avoidance in achievement situations. (Author)