“UKAT is a subject thesaurus which has been created for the archive sector in the United Kingdom. It is a controlled vocabulary which archives can use when indexing their collections and catalogues.” “The backbone of UKAT is the UNESCO Thesaurus (UNESCO), a high-level thesaurus with terminology covering education, science, culture, the social and human sciences, information and communication, politics, law and economics. … However, while UNESCO covers a broad range of subject areas, it often lacks the depth of detailed terminology required by archives for indexing. It was therefore decided that UKAT should extend and adapt UNESCO to incorporate indexing terms which repositories and projects had devised themselves or incorporated from other schemes, such as Library of Congress Subject Headings or the British Education Thesaurus. UKAT has thus been created as a thesaurus conforming to international standards, with the coherent structure of UNESCO, but also significantly enhanced to include terms of relevance to the archive community and its users. Particular emphasis has been given to incorporating terms reflecting the histories and experiences of groups which are under-represented among archive users, to encourage their participation in the archival heritage in line with national priorities for the sector.”