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Abstract

Obituary. On 26 November 2020 the information/knowledge professions lost a pioneer whose work has been an inspiration to successive generations of our colleagues, and still influences knowledge organization techniques today. Jean Aitchison was probably best known for her innovative 1969 publication Thesaurofacet, combining a faceted classification with a thesaurus, and for the classic text Thesaurus construction: a practical manual which she co-authored through four editions starting in 1972. Those two works provided, respectively, a model for best practice and a crystal clear guide to the intellectual task of building a thesaurus.