His research focuses on the development of collaborative software tools and educational approaches to foster the skills needed for deliberation, argumentation, and wicked problems. This work is based on his research on the semiotic and epistemological foundations of learning which he published in the fields of philosophy, argumentation theory, conflict management, and education. He developed the collaborative argument mapping tool "AGORA-net" and is currently working on the Reflect! platform which focuses on consensus building on wicked problems in educational and professional settings. His projects are supported, among others, by grants from the U.S. Department of Education and NSF’s "Cyberlearning and Future Learning Technologies" program.