The main purpose of this study was to determine the relation between the self-efficacy, feedback and personality traits. The participants were 114 psychology students attending their first and third year from the University of Novi Sad. In the first part of the research, all subjects completed The NEO-PI-R (Costa and McCrae, 1992.). In the second phase the subjects were asked to create a short measurement scale. Before and after this task, as well as after the given feedback, the students completed The Self-efficacy Questionnaire (Terry, 1995). The feedback was the criterion to divide subjects into three groups: the first group received the positive, the second negative, and third group received no feedback. Criteria variables in the MANCOVA (repeated measures) were the estimated success, difficulty and ability to perform the task in the three stages of measurement. Predictor variables were the type of the feedback and the personality traits, as covariates. The results suggest that before feedback, the impact of traits on the self-efficacy was significant. But after received feedback, self-efficacy was related to the type of received feedback only. These results showed that self-efficacy was significantly influenced both by personality traits and feedback context.