document: Books on demand : just-in-time acquisitions The Purdue University Libraries Interlibrary Loan unit proposed a pilot project to purchase patrons ' loan requests from Amazon . com , lend them to the patrons , and then add the titles to the collection . Staff analyzed previous monograph loans , developed ordering criteria , implemented the proposal as a pilot project for six months , and evaluated the resulting patron comments , statistics , and staff perceptions . As a result of enthusiastic patron comments and a review of the project statistics , the program was extended
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