Panayiotis Zaphiris is a senior lecturer at the Centre for Human-Computer Interaction Design, School of Informatics of City University, London. Before joining City University, he was a researcher at the Institute of Gerontology at Wayne State University, where he also got his Ph.D. in industrial engineering. Giorgos Zacharia is the founder and chief scientist of Open Ratings Inc. (ORI), and a Ph.D. student in computer science at the Center for Biological and Computational Learning of the MIT Computer Science and Artificial Intelligence Laboratory, USA. He is a native of Cyprus, where he set up the country's first commercial Web site, and is the chairman, CEO and co-founder of Kypros-Net Inc. in Cyprus.