This book constitutes the refereed proceedings of the First European Symposium on Ambient Intelligence, EUSAI 2003, held in Veldhoven, The Netherlands in November 2003. The 32 revised full papers presented were carefully reviewed and selected for presentation in the book. The papers are organized in topical sections on ubiquitous computing, context awareness, intelligence, and natural interaction. Ambient intelligence refers to a world in which people are surrounded with electronic environments that are sensitive and responsive to people. More specifically this means that electronic devices are bound to disappear into people's backgrounds by integrating them into the environment extending their functionality to provide ubiquitous communication, information, and entertainment through inobtrusive and natural interaction with the user.