The purpose of this book is to present and discuss current trends and issues in technology-enhanced learning from a European research perspective. Being a multifaceted and multidisciplinary topic, technology-enhanced learning is considered from four different viewpoints, each of which constitutes a separate part in the book. Parts include general as well as domain-specific principles of learning that have been found to play a significant role in technology-enhanced environments, ways to shape the environment to optimize learners’ interactions and learning, and specific technologies used by the environment to empower learners. A postface part is included to discuss the work presented in the preceding parts from a computer science and an implementation perspective. This chapter introduces the origin of the work presented in this book and gives an overview of each of the parts.