The amount of physical space available is a vital issue for virtually all law libraries. In this article, Dunstan Speight, Library Manager at City law firm Berwin Leighton Paisner LLP, presents the issues involved in reducing and retaining library materials, to help library managers present a sound business case for maintaining the collection they need. Dunstan's experience is that of a law firm librarian, but it is hoped that much of what follows will also be relevant to librarians in other sectors.