Book excerpt: The International Handbook of Virtual Learning Environments was developed to explore Virtual Learning Environments (VLE’s), and their relationships with digital, in real life and virtual worlds. The book is divided into four sections: Foundations of Virtual Learning Environments; Schooling, Professional Learning and Knowledge Management; Out-of-School Learning Environments; and Challenges for Virtual Learning Environments. The coverage ranges across a broad spectrum of philosophical perspectives, historical, sociological, political and educational analyses, case studies from practical and research settings, as well as several provocative "classics" originally published in other settings.