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When a library buys a title, they also choose an access model that determines how many people can use the book simultaneously such 1-user, 3-user, Non-Linear™, or Unlimited Access.  Extended Access prevents turn-aways when owned titles are in use.  

While most of access model names are intuitive, Non-Linear requires additional clarification.  With Non-Linear multiple users can access the ebook at the same time.  There are a set number of lending days per title per year, typically up to 325 days.  Lending days reset annually.  Those days accommodate any scenario that may occur during the year – from high demand one semester to lower demand the next.  After 12 months, the lending days automatically reset at no additional cost.  The librarian controls how many loan-days to offer to patrons each time a Non-Linear copy is used—for example, they could chose 1 day for online loans, and 3 days for downloads.  

With Extended Access, if you’ve reached the maximum use on a title, and another researcher needs it, the library can upgrade to another access model when available, purchase another copy or additional loan days in the Non-Linear model, or initiate a just-in-time short-term loan. Libraries set the rules for handling extended access at the outset, so that access can be automatically granted at the time of need.

Perpetual Access models are most effective when paired with a model that enables affordable, broad-scale access such as Subscription or Demand-driven Acquisition with Short-Term Loan (STL).

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