The oldest social work education institution of Turkey is Hacettepe University Department of Social Work. One of the most important goals of the Theory of Social Work 2 course given in this department is to improve the application skills of students. Thus, a group work is conducted with voluntary students throughout this course where the instructor functions as a facilitator. In this group work, students are expected to develop an insight and self-awareness of themselves. The present study aimed at determining the effect of group work on the self-efficacy of the 2(nd) grade students receiving social work education. The group work was constructed on the basis of creating awareness for them to know themselves. Therefore, the pretest-posttest comparison group design was employed. The general self-efficacy scale was used as the pretest tool and the posttest tool. Based on the said design, 46 students (12 people constituting the in-group and 34 people constituting the out-group) were included in the study. A group work lasting 6 weeks was conducted with the in-group. The out-group, on the other hand, only observed the group work, and took notes. Then the differences between the scores obtained by the in-group members before the group work and the scores obtained by them after the group work were examined, and the differences between the in-group and the out-group score averages before and after the group work were analyzed. (C) 2015 The Authors. Published by Elsevier Ltd.