Weeding is one of the best ways to make long-term improvements of any library collection and this is a completely revised edition of Slote's text on the subject. Based on the author's ongoing research, field observations and interviews with library professionals, the book has been thoroughly updated and the process of weeding simplified. Slote shows librarians how to identify the core collections versus the weedable collections. After reviewing current weeding practice and standards, he discusses a variety of traditional and computer-assisted methods for weeding. Slote's approach is based on the new understanding of the relationship between in-library use and circulation use. A section dealing with reference (non-circulating) collections has been added, and the chapter on computer-assisted weeding has been completely rewritten to streamline the weeding process. All forms have been redesigned. A practical guide that outlines step-by-step procedures, and a source on the research and thought in the field, this book is also a good textbook for library schools.