| 94-00 | General reference works (handbooks, dictionaries, bibliographies, etc.) |
| 94-01 | Instructional exposition (textbooks, tutorial papers, etc.) |
| 94-02 | Research exposition (monographs, survey articles) |
| 94-03 | Historical (must also be assigned at least one classification number from Section 01) |
| 94-04 | Explicit machine computation and programs (not the theory of computation or programming) |
| 94-06 | Proceedings, conferences, collections, etc. |
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94Axx | Communication, information |
94Bxx | Theory of error-correcting codes and error-detecting codes |
94Cxx | Circuits, networks |
| 94D05 | Fuzzy sets and logic (in connection with questions of Section 94) [See also 03B52, 03E72, 28E10] |