Abstract
In 2015, Rutgers became only the second accredited law school in the United States to select the open-source ILS, Koha. The merger of two unique catalogs at Rutgers Law School has presented unique challenges with respect to migration mapping, data recall for large records, and relevancy ranking, all of which affect search results and usability of the OPAC. System migrations always result in some data being lost or incorrectly transferred. The hope is to minimize just how much data is compromised while fixing errors that might not have come to light but for the migration.