To make the most of your library’s acquisitions budget, you need precise data that reveals your library's subject-matter strengths, gaps, and overlaps. OCLC’s WorldCat Collection Analysis is a Web-based service that provides analysis and comparison of library collections based on holdings information contained in the WorldCat database. Attend this session to learn how you can: evaluate your library’s collections thru peer comparisons, use the new Circulation Analysis to see how your collection is being used, use the ILL analysis tools to evaluate your borrowing and lending activities, and produce detailed reports with spreadsheets and graphs. Presented by Christa Burns at the Sirsi Midwest Users' Group Annual Pre-Conference - July 24, 2008.