The ninth edition of the Thesaurus of Psychological Index Terms provides the psychological vocabulary used to search the 1.7 million records in the PsycINFO database. The Thesaurus contains well over 5,000 index terms with easy-to-read scope notes and definitions. This easy-to-use reference tool is divided into three sections: the Relationship Section, the Rotated Alphabetical Terms Section, and the Clusters section. In the Relationship Section, each...