Library classification: Difference between revisions

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Library classification is associated with library (descriptive) cataloging under the rubric of ''cataloging and classification'', sometimes grouped together as ''technical services''. The library professional who engages in the process of cataloging and classifying library materials is called a ''cataloger'' or ''catalog librarian''. Library classification systems are one of the two tools used to facilitate [[subject access]]. The other consists of alphabetical indexing languages such as Thesauri and Subject Headings systems.

LibraryThe classificationpractice of library classification is a pieceform of the more general task of [[classification]]. The work consists of two steps. Firstly, the subject or topic of the material is ascertained. Next, a '''call number''' (essentially a book's address) based on the classification system in use at the particular library will be assigned to the work using the notation of the system.

Unlike subject heading or thesauri where multiple terms can be assigned to the same work, in library classification systems, each work can only be placed in one class. This is due to shelving purposes: A book can have only one physical place. However, in classified catalogs one may have main entries as well as added entries. Most classification systems like the [[Dewey Decimal Classification]] (DDC) and [[Library of Congress Classification]] also add a [[cutter number]] to each work which adds a code for the main entry (primary access point) of the work (e.g. author).