The document discusses the transition from print to digital libraries and ebooks. It notes that the amount of published information has vastly increased, making it difficult for individuals to read everything relevant. Modern libraries and users now face changes in content, technology, and research methods. The document then examines trends in ebook usage, features like embedded references and images, and tools that help researchers. It analyzes different ebook purchasing models such as ownership, access fees, working with publishers or aggregators, and demand-driven or usage-driven collection options. Case studies show predicting usage is difficult and access to broader collections provides more value.