The ACM Computing Classification System is a subject classification system for computer science devised by the Association for Computing Machinery. The system has gone through six revisions, the first version being published in 1964, and revised versions appearing in 1982, 1983, 1987, 1991, and the now current version in 1998.

The system is comparable to the Mathematics Subject Classification in scope, aims and structure, being used by the various ACM journals to organise subjects by area, and being hierarchically structured as a series of four increasingly finely grained classifications with longer description codes.

The 1998 classification

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The classification consists of a set of categories, organised in three levels, of which the top-level categories are:

A. General Literature

B. Hardware

C. Computer Systems Organization

D. Software

E. Data

F. Theory of Computation

G. Mathematics of Computing

H. Information Systems

I. Computing Methodologies, which contains:

I.2 Artificial Intelligence

I.2.4 Knowledge representation formalisms and methods

J. Computer Applications

K. Computing Milieux

External links

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• ACM Computing Classification System is the homepage of the system, including links to three complete versions of the system, for 1964 1991 ^*
• XML version of the ACM Computing Classification System version 1998