Many thanks to everyone who responded to my questions about the services offered to different categories of readers. We will be posting a summary here shortly. In the meantime it has lead us to ask yet another question. 61% of respondants do not offer an ILL service to non-members of their university/department. Of those that do offer an ILL service many charge extra to certain categories. So the question is this: If you offer different services to different categories of users (eg visiting or retired academics who have purchased a library ticket, visiting students from other institutions, commercial users) how do you distinguish between them and police the system? Penny ------------------- Penny Roberts Document Supply Department Radcliffe Science Library Oxford University [log in to unmask] requests: [log in to unmask]