The purpose of the 7th International Conference on Enterprise Information Systems (ICEIS) was to bring together researchers, engineers and practitioners interested in the advances and business applications of information systems. Five simultaneous tracks have been held, covering different aspects of Enterprise Information Systems Applications, including Enterprise Database Technology, Systems Integration, Artificial Intelligence, Decision Support Systems, Information Systems Analysis and Specification, Internet Computing, Electronic Commerce and Human Factors. ICEIS focuses on real world applications: therefore authors were asked to highlight the benefits of Information Technology for industry and services. During the conference there was an interesting debate on how to solve business problems, using IT. Paper presentations included the description of advanced prototypes, systems, tools and techniques as well as general surveys indicating future directions for information systems and technologies. Papers included in the book are the best papers presented at the ICEIS 2005 conference.