APA's Thesaurus of Psychological Index Terms [registered] helps researchers search the PsycINFO[registered] and PsycARTICLES[registered] databases with maximum precision. The Tenth Edition updates users on cutting-edge terminology and compensates for changes in scientific vocabulary. Its publication marks the 30th anniversary of the Thesaurus of Psychological Index Terms (1974 - 2004). Among the dozens of new descriptors or cross-referenced terms are Acute Stress Disorder; Bullying; Cognitive Science; Distance Education; Grounded Theory; Online Therapy; Polymorphism; Procedural Justice; Religious Fundamentalism; Social Loafing; Telemedicine;... and many more! The Thesaurus now contains more than 7,800 standard or cross-referenced terms. Sections and Features; All of the features that have made the Thesaurus a benchmark in the database industry have been updated. Relationship Section. Hundreds of hierarchies, which show relationships between a descriptor and broader, narrower, and related terms, have been redesigned to make the vocabulary easier to understand and navigate. A new "Historical Note" field is included in the Tenth Edition. This field provides information about changes to a term, the range of years a term was in use, and instructions for searching. This information was previously captured in the "Scope Note" field, but with the addition of the "Historical Note," the "Scope Note" will be used primarily for definitions of terms. Permuted List. The new and revised descriptors and cross-referenced terms also appear in the "Rotated Alphabetical Terms Section," which alphabetizes every term by each of its component words. This section makes it easy to find all descriptors containing a particular word or phrase. Conceptual Clusters. The Term Clusters section of the Thesaurus groups terms into comprehensive lists for high-interest topics including: Computers, Disorders, Education, Legal Processes and Issues, Neuropsychology, Industrial and Organizational Psychology, Statistics, Testing, and Treatment. Other Refinements; Historical Note Field: This field contains information on the historical usage of terms in the PsycINFO database since their introduction including changes to a term, the range of years a term was in use, and instructions for searching. Retrospective Indexing (Re-indexing): PsycINFO records from the past ten years will be retrospectively indexed with new terms from the Tenth Edition. This will provide users with more comprehensive results when searching with terms recently introduced to the Thesaurus.