Ninety undergraduate students who scored as high or low on the Snyder Self-monitoring Scale participated in an experiment designed to determine the joint effects of self-monitoring and controllable or uncontrollable outcomes upon subsequent performance on three short-term memory tests. High and low self-monitoring subjects were assigned to one of three conditions: (1) controllable feedback, in which subjects received response contingent positive, "correct," and negative, "incorrect," feedback on a word association task; (2) uncontrollable feedback, in which subjects were given noncontingent feedback (70% negative and 30% positive); and (3) no-treatment. Measures of attentional focus were included in order to examine the role of attentional processes in the obtained results. In addition, the joint effects of treatment and self-monitoring on subjects' attributions were investigated. As predicted, the performance of high selfmonitors was significantly impaired by uncontrollability (learned helplessness), while that of low self-monitors was facilitated by controllability (learned competence). Results were discussed as supporting the contention that high self-monitors rely heavily on knowledge of environmental contingencies in order to control their environment. When their typically effective strategy is unsuccessful, "helplessness" is induced. Low self-monitors, who are less concerned with exercising control over environmental events, evidence diminished attention to and utilization of external stimuli. However, when these stimuli are made salient and the low self-monitor is positively reinforced for processing these stimuli, "competence" is induced. Results also suggest that high self-monitors, as compared with low self-monitors, are more likely to employ self-enhancing, defensive strategies. Such strategies may protect self-esteem and decrease the likelihood of long term negative effects.