OCLC’s GreenGlass tool is designed to help librarians make data-driven decisions and contains a powerful report builder. However, while USMAI libraries have access to GreenGlass through the end of August 2019, the data in GreenGlass is a static snapshot from June 2017. In order to look at items added since June 2017 and at updated circulation statistics, librarians need to supplement the GreenGlass reports with data from ALEPH. Stephanie Ritchie will walk attendees through the process of merging data from GreenGlass and Aleph to create usable, up-to-date reports which can then be used for collection management or statistical purposes.