Hierarchy classification:

1. top of the aat hierarchies
2. Agents Facet
3. Organizations (hierarchy name)
4. organizations (groups)
5. institutions (organizations)
6. [institutions by activity]
7. educational institutions
8. schools (institutions)

Anotations

Scope note:

Educational institutions for the second stage of a three-tier educational system, falling intermediate between an elementary school and an upper, senior, or high school. The age ranges and grades or forms included in middle schools differ according to the system, but an example would be for children ages 13 to 16, covering grades 6 through 9.