The purpose of this study was to investigate the effects of an elaborated assessee's role on metacognitive awareness, performance and attitude in peer assessment. Two intact groups (a total of 82 students) were randomly assigned to a treatment condition (having back-feedback activity) or a control condition (not having back-feedback activity). The results indicated that, regarding metacognitive awareness, when participants played the elaborated assessee role, they tended to report higher metacognitive awareness in their learning process. Regarding performance, when participants played the elaborated assessee role, they tended to receive better scores in making a concept map. Regarding attitude, when participants played the elaborated assessee role, they reported greater motivation towards the peer assessment. The findings of this study suggest instructional implications for those who want to employ peer assessment as a learning method by showing the effectiveness of a well-developed role design, specifically one that includes the back-feedback activity. (Contains 1 figure and 1 table.)