A description of a bully can be a description of a principal.
An organization can be constituted-of-or-filled-with principals.
A principal can be instrumental in getting a support of a (teaching staff).
An article may be published in a newsletter of a national-association of principals.
A national-association of principals may form a partnership.
A system may relieve a principal of a lot of responsibilities.
A reduction can be in an average age of (school principals).