  Several different controlled vocabularies have been developed and used by the
astronomical community, each designed to serve a specific need and a specific
group. The Unified Astronomy Thesaurus (UAT) attempts to provide a highly
structured controlled vocabulary that will be relevant and useful across the
entire discipline, regardless of content or platform. As two major use cases
for the UAT include classifying articles and data, we examine the UAT in
comparison with the Astronomical Subject Keywords used by major publications
and the JWST Science Keywords used by STScI's Astronomer's Proposal Tool.
