1. Lecturers, Department of Library Science and Information Systems, TEI of Thessaloniki, P.O. BOX 141, GR-57 400, Thessaloniki, Greece. Tel.: ; Fax: ; E-mail: mgarou@libd.teithe.gr; rsiatri@yahoo.gr, and Deltos Research Group, Greece
2. Professor of Information Science and Head, Department of Information and Communications, Manchester Metropolitan University, UK