Evaluating material and tutors. Students opinions and points for improvement (Paper in Greek). 1st Panhellenic Conference in Open and Distance Education, 2001. ,
A survey on student dropout rates and dropout causes concerning the students in the Course of Informatics of the Hellenic Open University, Computers & Education, vol.39, issue.4, pp.361-377, 2002. ,
DOI : 10.1016/S0360-1315(02)00072-6
Current Developments and Best Practice in Open and Distance Learning, International Review of Research in Open and Distance Learning, vol.1, issue.1, 2000. ,
Human and Artificial Agent's Conversations on the GRID, 1st Int. LeGE- WG Workshop, 2002. ,