Dear Colleagues The development of electronic journals and the cost of journal subscriptions are forcing libraries to assess the usage of open shelf material. Here at the Radcliffe Science Library (Oxford) we are looking at possible methods of measuring this usage. If you have used any method in your own library I should be most interested to hear from you. Many thanks, Yvonne Hibbott Yvonne Hibbott, Life Sciences and Medicine, Radcliffe Science Library, Parks Road, Oxford OX1 3QP. Tel: 01865 272853/272802 http://www.bodley.ox.ac.uk/rsl