Hierarchy classification:

1. top of the aat hierarchies
2. Agents Facet
3. Organizations (hierarchy name)
4. organizations (groups)
5. services (organizations)
6. information services
7. reference services

Anotations

Scope note:

Automated reference services which provide direct answers to users' queries, or provide direct access to electronically stored databases containing the needed information. For automated information services which provide data either directly or in the form of citations to data sources, use "information retrieval services."