ACM Computing Classification System

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The ACM Computing Classification System (CCS) is a subject classification system for computing devised by the Association for Computing Machinery (ACM). The system is comparable to the Mathematics Subject Classification (MSC) in scope, aims, and structure, being used by the various ACM journals to organize subjects by area.


The system has gone through seven revisions, the first version being published in 1964, and revised versions appearing in 1982, 1983, 1987, 1991, 1998, and the now current version in 2012.


It is hierarchically structured in four levels. For example, one branch of the hierarchy contains:

Computing methodologies
Artificial intelligence
Knowledge representation and reasoning
Ontology engineering

See also[edit]


  • Coulter, Neal (1997), "ACM's computing classification system reflects changing times", Communications of the ACM, New York, NY, USA: ACM, 40 (12): 111–112, doi:10.1145/265563.265579, S2CID 42548816.
  • Coulter, Neal (chair); French, James; Glinert, Ephraim; Horton, Thomas; Mead, Nancy; Ralston, Anthony; Rada, Roy; Rodkin, Craig; Rous, Bernard; Tucker, Allen; Wegner, Peter; Weiss, Eric; Wierzbicki, Carol (January 21, 1998), "Computing Classification System 1998: Current Status and Future Maintenance Report of the CCS Update Committee" (PDF), Computing Reviews, New York, NY, USA: ACM: 1–5.
  • Mirkin, Boris; Nascimento, Susana; Pereira, Luis Moniz (2008), "Representing a Computer Science Research Organization on the ACM Computing Classification System", in Eklund, Peter; Haemmerlé, Ollivier (eds.), Supplementary Proceedings of the 16th International Conference on Conceptual Structures (ICCS-2008) (PDF), CEUR Workshop Proceedings, vol. 354, RWTH Aachen University, pp. 57–65.

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