The book "Learning and Collaboration Technologies" is a comprehensive collection that presents the refereed proceedings of the second International Conference on this topic, held as part of the 17th International Conference on Human-Computer Interaction (HCII 2015) in Los Angeles. With a careful selection from over 4,800 submitted papers, this volume provides deep insights into the latest developments and research in the field of technology-enhanced learning and collaboration. The contributions cover a wide range of topics, including adaptive and personalized learning methods, virtual worlds and agents for learning, as well as the use of serious games and information and communication technologies in education. The diversity of topics addressed makes this book a valuable resource for researchers, practitioners, and students who are engaged with the challenges and opportunities of modern learning technologies.