This project attempts to replicate the most exact procedure used by Aronson & Carlsmith (1962, *Journal of Abnormal and Social Psychology*): "Performance Expectancy as a Determinant of Actual Performance." Original Abstract: Theories of cognitive consistency were extended to account for individual differences in self-relevant expectancies. This extension led to the following prediction: if a person expectsto perform poorly in a particular endeavor, a good performance will be inconsistent with his expectancy; he will attempt to reduce dissonance by denying this performance. In a laboratory experiment, some subjects were led to expect to perform a task excellently—others, poorly. They then performed the task, were given false scores which either confirmed or disconfirmed their expectancies, and were surreptitiously allowed to change their responses on the task. The subjects who were given information which was inconsistent with their performance expectancies changed significantly more of their responses than those who were given consistent information. Thus, subjects who expected to perform poorly but performed well exhibited more discomfort (changed more responses) than subjects who expected to perform poorly and did perform poorly.