Abstract
The present study investigated how accurately people predicted their own and others' task performances. Thirty female undergraduates participated in a group of three and performed a writing task. Participants observed the look of each other during the task and predicted their own and peers' performance in another writing task. As results, there were no differences between self-prediction and other-prediction. Participants predicted both their own and peers' performance more positively than their actual performances. Whereas self-rated personalities were not correlated with self-predictions, the estimated personalities of others were correlated with other-predictions. Although previous studies suggest that people would use their "inside information" when predicting their own behavior, they may not use their self-concept primarily. On the other hand, when predicting the performance by others, people may use the positive information about others' personalities inferred in little time and overlook situational constraints on others' behavior.
