Abstract
We proposed the method of revising an evaluated score in considering of the evaluator's characteristic for an impartial feedback in a peer evaluation. Because it is difficult to evaluate all learners, peer evaluation data include many missing responses. In the proposal method, we assumed the evaluators' characteristic modeling based on the item response theory, and the evaluated score is revised by using the difference of estimated evaluator's characteristic and the evaluator of an average evaluation. In the proposal method, we assumed the evaluators' characteristic modeling based on the item response theory, and an evaluated score is revised by using the difference of estimated evaluator's characteristic and the evaluator of an average evaluation. It was confirmed that the revised score was appropriate evaluation by real data. We practiced peer evaluation five times in our class. As a result of practice, it was found that the evaluators received feedback with revised score improved the evaluation ability, but the evaluator received only evaluation value before revision did not improved. Because the above-mentioned result, it was shown that proposed revision method was effective to an impartial evaluation and the improvement of the evaluation ability.