Several years ago the idea was raised of compiling a users' directory for the Art & Architecture Thesaurus, in order to help the AAT staff understand the types of organizations using the Thesaurus and thus provide effective services to AAT users and respond to their needs. The ultimate goal of the directory was to share, in published form, the information collected among the current users of the AAT, in order to promote networking and the exchange of information. After the publication of the first edition of the AAT in 1990, it was obvious that the number and diversity of AAT users was growing rapidly, but the AAT staff found keeping track of who was using the Thesaurus and how a challenge. Consequently, the idea of compiling a user database was born. This database would contain not only profiles of the various organizations using the AAT but also information on their cataloging and indexing practices.