Part

(Namespace: plural glossary)

Type of term	Possible type of headmate
Synonyms or near-synonyms	Alter, fragment, insider, self
Antonyms or near-antonyms	Introject

A part is a self. Calling a self a “part” carries a connotation that the self in question has become specialized for certain specific cognitive or emotional functions due to splitting, and that the system cannot function as a gestalt without the part's cooperation.

Controversy

“Part” is terminology originating from the therapeutic model of internal family systems, which was implicated in the Alsana Castlewood tragedy. For this reason, even some systems who have headmates who could be called parts still choose not to use this word. Additionally, some headmates may feel the word “part” is dehumanizing.