标题:実践共同体,学習者共同体,そして知識構築共同体 : その違いはどこに?(準備委員会企画特別講演,I 日本教育心理学会第51回総会概要) [in Japanese] Communities of Practice, Learning Communities, and Knowledge Building Communities : Are There Differences?(Special Lecture Planned by the Organizing Committee,I General Outlines of the 51st Meeting of the Japanese Association of Educational Psychology) [in Japanese]