A Method of Long-Term Assessment in “Special Subject, Moral Education”: A Trial in a Conference on One Page Portfolio Assessment, Namiki HAGINO, 337号, 3, 14, Mar. 2019, This study presents a method of long-term assessment based on the theory of portfolio assessment in Special Subject, moral education, and shows its practice. Specifically, a conference primarily for children’s participation will be held, wherein children create their own portfolio consisting of accumulated sheets (OPP sheets) used in OPPA (One Page Portfolio Assessment). First, I clarified the new objectives of Special Subject, moral education, of which qualitative changes as well as effective methods of evaluation were sought for. Then I outlined how portfolio assessment, which involved authentic assessment as its theoretical basis, was utilized. Second, I identified the characteristics and issues of portfolio assessment, referring to previous studies about portfolio assessment in morality classes. Third, I showed significance of challenges involved in long-term evaluation based on “portfolio evaluation with accumulated OPP sheets,” and asserted its necessity to help concretize learning methods and overcome existing problems in primary education.