The e-psyche thesaurus covered topics related to psychology and psychological research. It was used for indexing records of the e-psyche database of psychology related articles and books. The thesaurus was available for search purposes to e-psyche database subscribers on the CSA, EBSCO, and iGroup database platforms. On December 31, 2003, the e-psyche database officially ceased to exist. EBSCO bought the rights to the database contents, to use in various products. The American Psychological Association (APA) subsequently licensed the content from EBSCO.