Information modelling and knowledge bases have become crucial in recent decades, not only in relation to information systems and computer science for the academic community, but also for the world of business in any area where information technology is applied. This book presents 15 full papers and 10 short papers edited following presentation and discussion at the 20th European Japanese Conference on Information Modeling and Knowledge Bases (EJC2010). This annual conference constitutes a worldwide forum, drawing together both researchers and practitioners for the exchange of scientific result.