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Classification schedules:

The printed volumes or machine-readable database that contain classification numbers and captions, arranged by subject in a logical, hierarchical manner. Also called schemes.

The classification schedules divide the entire field of knowledge into main classes, each covering a particular subject area (e.g., the social sciences in the Class H schedule; the fine arts in the Class N schedule, etc.). The main classes are further divided into subclasses, representing branches of the main subject area. Within each subclass, further subdivisions are made to specify form, place, time and subject (or topical) aspects. A hierarchical display is formed by the subject progressing from the general to the specific.

Using Class H as an example:

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