Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication (hierarchy name)
4. Information Forms (hierarchy name)
5. information forms (objects)
6. document genres
7. [documents by function]
8. correspondence
9. [correspondence by method of transmission]

Anotations

Scope note:

Communication by means of a system that allows computer users to exchange messages in electronic format on a network, often but not always comprising messages from one individual to one or many others via telecommunications links between computers or terminals.