This standard is the authoritative guide for constructing single-language thesauri, one of the most powerful tools for information retrieval. Written by experts in the field, Z39.19 shows how to formulate descriptors, establish relationships among terms, and present the information in print and on a screen. Included are thesaurus maintenance procedures and recommended features for thesaurus management systems. Extensive examples, suggestions for further reading, and a detailed index complete this outstanding standard. This will set the rule for thesaurus standards for years to come!