Theodora Kouvara (Department of Education Sciences - Special Education, University of Nicosia), Christoforos Karachristos (Hellenic Open University, Educational Content, Methodology & Technology Laboratory, 278 Patron-Claus Str., GR-263 35 Patras, Greece), Elias Stavropoulos (Hellenic Open University, Educational Content, Methodology & Technology Laboratory, 278 Patron-Claus Str., GR-263 35 Patras, Greece), Vassilios Verykios (Hellenic Open University, School of Science and Technology, 18 Parodos Aristotelous Str., GR-263 35 Patras, Greece.)