Program Committee for the AAAI Fall Symposium on Formalizing Reasoning with Visual and Diagrammatic Representations.
Program Committee for the Third International Conference on Information-Theoretic Approaches to Logic, Language, and Computation (6/16--6/19/98).
Program Committee for the LICS '98 Workshop on Logic and Diagrammatic Reasoning.
Program Committee for the Fourteenth Annual Meeting of the Japanese Cognitive Science Society (Atsugi, Japan, 6/18--6/20/97).
Editorial Board for Cognitive Studies: the Bulletin of the Japanese Cognitive Science Society (1997--2001).
Organizing Committee for the First International Sympoisum on Logic of Real-World Interaction (Tokyo, Japan, 1/30--1/31/02).
Executive Committee for the Japanese Cognitive Science Society (2002--Present).
Program Committee for Diagrams 2002: Second International Conference on Theory and Application of Diagrams (Callaway Gardens, GA, 4/18--4/20/02).
Program and Preparation Committee for the Ninteenth Annual Meeting of the Japanese Cognitive Science Society (Tatsunokuchi, Japan, 6/14--6/16/02).
Program Committee for the First European Workshop on Diagrammatics and Design (Bielsoko-Biala, Poland, 9/23--9/24/02).