A new ILS is a new opportunity to examine and evaluate existing data. The University of Tennessee Libraries conducted an extensive review of acquisitions data in preparation for migrating to an Ex Libris Alma system this year. What monograph and serials data should migrate to a new ILS? What are the decision points for migration and what the issues and implications associated with these decisions? Some data clean-up is probably a given, but what projects should be prioritized and why? This poster session will describe the process and decisions made at the University of Tennessee Libraries and report on the outcome of our migration – what we learned and what we would have done differently.