This book constitutes the refereed proceedings of the Third European Conference on Technology Enhanced Learning, EC-TEL 2008, held in Maastricht, The Netherlands, in September 2008. The 52 revised full papers presented were carefully reviewed and selected from numerous submissions. The conference covers the different fields of learning technologies: education, psychology, computer science. The papers address the design of innovative environments, computational models and architectures, results of empirical studies on socio-cognitive processes, field studies regarding the use of technologies in context, collaborative processes, pedagogical scenarios, reusable learning objects and emerging objects, groups and communities, learning networks, interaction analysis, metadata, personalization, collaboration scripts, learning adaptation, collaborative environments, resources, tangible tools, as well as learning management systems.