Conceptual modelling is fundamental to the development of complex systems, because it provides the key means of communication between systems developers, end-users and customers. Conceptual modelling provides languages, methods and tools to understand and represent the application domain; to elicit, conceptualise and formalise system requirements and user needs; to communicate systems designs to all stake-holders; to formally verify and validate system designs at a highlevel of abstraction; and to minimise ambiguities in system development. Initially, conceptual modeling mainly addressed data-intensive information systems and contributed to data modelling and database application engineering. the area of conceptual modeling has now matured to encompass all kinds of application areas such as e-applications (including e-business and e-learning), web-based systems (including the semantic web and ubiquitous systems), life sciences and geographic applications.

High-quality tutorials are a long-standing tradition of the ER conferences. they complement the depth-oriented accepted paper sessions and keynote talks by providing conference participants with broad overviews of emerging fields or clear syntheses of results in existing fields. For ER 2007, we invited Olga De Troyer, Frederic Kleinermann, Bram Pellens, and Wesley Bille (Vrije Universiteit Brussel), Martin Doerr, Christian-Emil Ore, and Stephen Stead (FORth), Dirk Langemann (University of