Access types Instant/momentary -- word definitions, crossword answers, reference works, and the like Temporary -- disposable eventually, but currently important. What you'd xerox and keep for a research paper, and never look at again Periodic -- journals, magazines, essay collections, sequential information--or reminders of access to disposable content that is available Continuous -- Always-on, unpunctuated resources: Radio, stock feeds, CNN.com Permanent -- the book, the magazine, the e-book, the download. You own, you control On-demand -- Info comes to you because you request it Impulse/On-discovery -- you don't know you want it until you discover it