[Michlib-l] Encyclopedias/Reference Materials?

Hello Librarians, These questions are aimed more towards the various school-public libraries, but could be applicable to everyone: How often do you modernize your reference sections? - Is it on a rolling basis, or an all-at-once deal? How broad of a reference section do you maintain? - Do Mel resources supplement your reference, or have they replaced them? I would like to structure reference modernization into our acquisitions, but with the prevalence of the internet, we have seen declining use of the resources by our students and public. An attempt at increasing circulation was made some years ago by moving some materials into the non-fiction sections, but that has not helped to a large extent. Thanks, Ross