Thesauri, or controlled vocabularies, are long-established tools for improving how our users navigate and search our collections. New technologies and services provide opportunities to enhance and expand these legacy thesauri. The Inter-university Consortium for Political and Social Research’s (ICPSR) own thesauri was developed decades ago and has been used by hundreds of thousands of students and researchers when browsing and searching the ICPSR catalog. This presentation will discuss ways in which ICPSR can update our thesauri. For instance, can we completely switch to standardized identifiers, like ROR and ORCiD, rather than updating our own Organizational Names Authority List and Personal Names Authority List? How can we make better use of complementary thesauri, like the Library of Congress Subject Headings or the European Language Social Science Thesaurus? In what ways can we remediate terminology using outdated or non-preferred terms? Discussion points will include tradeoffs and resource costs. jmwink@umich.edu