His research areas include Computer Supported Ubiquitous Learning and Mobile Learning, CSCL (Computer Supported Collaborative Learning), CSCW (Computer Supported Cooperative Work), and CHI (Computer Human Interaction). In those areas, he has published over 50 peer-reviewed journal and 150 international conference papers. He has been the recipient of numerous Best Papers awards, among which are “Best Paper Award of Japanese Society for Information and Systems in Education in 1998”, WebNet 1999 Top Paper Award, ICALT 2006 Best Paper Award, MULE 2007 Best Paper Award, CollabTech 2008 Best Paper Award, and ICCE 2008 the Best Paper Running-up Award.