Membership in Scientific Councils & Organizations
Member of ACM/SIG CHI (International Association for Computing, Special Interest Group-Computer Human Interaction), and the IEEE Computer Society since 1994;
Member of IFIP (International Federation for Information Processing ) Executive Board TC.3, since 1989;
Member of ISTE (International Society for Technology in Education) Board of Associate Editors, since 1991;
Member of the International Committee of the Association for the Development of Computer-based Instructional Systems (ADCIS, USA), since 1989;
Member of the CORE Research Group, International Institute for Applied System Analysis(IIASA), Vienna, Austria, since 1979.
Fellowships & Study Grants
DAAD Fellowships: University of Bonn (1968, 1970);
Alexander von Humboldt Fellowship and visiting professor, University of Bonn (1974, 1975),
University of Bielefeld (1982);
JSPS (Japan Society for Promotion of Science) Fellowship, State University of Kyoto (1988);
NAS (National Academy of Sciences) Study Grant, University of California, Campus Davis (1989);
Research Fellowship, University of Twente (1991).