Anastasis N. Riggas is a Ph.D. holder and a researcher at the Department of Informatics, University of Piraeus. His Ph.D. Subject was: Designing Virtual Enterprises for E-Services using Systemic Methodologies. He is also a Certified Systemic Analyst Professional in E-Business ISO 17024. His current research interests include systemic methodologies, systems thinking, simulation, software technology and issues of virtual enterprises and e-services. He is also a Master's Diploma holder from the Hellenic Open University (Studies in Education). He has published and presented articles in various research journals and international conferences. He is also a full member of the Hellenic Society ...