ACM's first classification system for the computing field was published in 1964. Then, in 1982, the ACM published an entirely new system. New versions based on the 1982 system followed, in 1983, 1987, 1991, and 1998. The 2012 scheme utilizes a new poly-hierarchical structure and a more in-depth approach than the 1998 version. It no longer uses the letter-and-number coding of the previous versions. The old scheme has been mapped to the new, and both the 1998 and 2012 terms are available on Citation Pages of all indexed articles in the ACM Digital Library.
Used for indexing and searching of the PAIS International database, part of the Public Affairs Information Service, which CSA (Cambridge Scientific Abstracts) acquired from OCLC in 2005. “The PAIS International database from CSA contains citations to journal articles, books, government documents, statistical directories, grey literature, research reports, conference reports, publications of international agencies, microfiche, Internet material, and more. Newspapers and newsletters are not indexed.
“The Literacy Thesaurus (LT) is the key that enables users to search effectively for subject information in LINCS.” “The Literacy Information and Communication System, commonly referred to as LINCS, is the backbone of the Institute's [National Institute for Literacy] dissemination system, providing information on a wide variety of literacy relevant topics, issues, and resources.”
Enables searches in any or all of six H.W. Wilson Company databases, containing applied science abstracts, applied science indexes, applied science full texts, the Biography Reference Bank, the Book Review Digest, and business abstracts.
“SNOMED Clinical Terms (SNOMED CT) is an extensive clinical terminology that was formed by the merger, expansion, and restructuring of SNOMED RT® (Reference Terminology) and the United Kingdom National Health Service (NHS) Clinical Terms (also known as the Read Codes). It is the most comprehensive clinical vocabulary available in English (or any language). SNOMED CT is concept-oriented and has an advanced structure that meets most accepted criteria for a well-formed, machine-readable terminology.
“Taxonomy experts at NewsIndexer have created a specialized group of terms with the newspaper industry's indexing needs in mind: a controlled vocabulary that reflects the media's constantly evolving vernacular.”
The Legislative Indexing Vocabulary (LIV) is a set of approximately 5,000 subject indexing terms for use with the THOMAS Bill Summary & Status Databases prior to the 111th Congress.
The Legislative Indexing Vocabulary has been replaced by CRS Legislative Subject Terms.
“The Inspec Thesaurus contains a listing of the controlled terms and the lead-ins or cross-reference terms used in the Inspec database. It also gives the relationship between terms, the dates on which they were added, and the terms in use before these dates. The Thesaurus contains over 9400 preferred terms.”
