The classification of articles embodies a taxonomy that should be helpful to the reader in grasping the scope of the material contained in this volume. Articles are classified under nine categories:
1. Hardware
2. Computer System
3. Information and Data
4. Software
5. Mathematics of Computing
6. Theory of Computation
7. Methodologies
8. Applications
9. Computing Milieux
Each Encyclopedia article appears at least once in this classification. Some titles appear more than once in order to avoid the clutter of cross-references.