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The structure of this classification has been derived from the 1991 and 1998 ACM Computing Classifications, with their kind permission. Alterations and additions which have been made to the subject headings and notation are the sole responsibility of UCL Library.
| Letter | Sub heading |
| A | General |
| B | Hardware |
| C | Computer systems organization |
| D | Software |
| E | Data |
| F | Theory of computation |
| G | Mathematics of computing |
| H | Information systems |
| M | Computing methodologies |
| W | Computer applications |