Dissociative Identity Disorder (or DID) is a traumagenic form of multiplicity that can include anywhere from two to hundreds of system members. Unsurprisingly, considering the name of the diagnosis, DID is by nature disordered.
Diagnostic Criteria
1. Two or more distinct identities or personality states are present, each with its own relatively enduring pattern of perceiving, relating to and thinking about the environment and self.
2. Amnesia must occur, defined as gaps in the recall of everyday events, important personal information and/or traumatic events.
3. The person must be distressed by the disorder or have trouble functioning in one or more major life areas because of the disorder.
4. The disturbance is not part of normal cultural or religious practices.
5. The symptoms are not due to the direct physiological effects of a substance (such as blackouts or chaotic behavior during alcohol intoxication) or a general medical condition (such as complex partial seizures).