This third volume in a sub-series based on the joint effort of Nordic and Japanese scientists in the field of information modelling and knowledge bases contains 45 contributions. The work is a continuation of an effort to study foundations and applications of conceptual modelling in various environments. The motivation of these efforts is the fact that conceptual modelling and knowledge representation, together with various kinds of inference systems are important subfields in the design and use of information systems. They are becoming more and more important in nearly all fields of engineering, too. The modelling is essential in many disciplines, such as database design, knowledge engineering, logic, artificial intelligence, cognitive science, philosophy and linguistics.