I work at Queen Margaret University library as a Helpdesk Adviser. One of my duties involves running a daily report for High Demand Holds. If there are 4 or more holds, I then take the student details, course details, book details and after searching our suppliers website, submit a purchase request to the appropriate subject librarian. I wondered, however, if there are other more effective ways to measure the demand: supply ratio for library stock? One problem is that students will sometimes decline to place a hold on a book if they need the book urgently.