Table 1

DSM-IV-TR DID Criteria11

The presence of two or more distinct identities or personality states, each with its own relatively enduring pattern of perceiving, relating to, and thinking about the environment and self.
At least two of these identities or personality states must recurrently take control of the person's behavior.
Patients have an inability to recall important personal information that is too extensive to be explained by ordinary forgetfulness.
The disturbance must not be due to the direct physiological effects of a substance … or a general medical condition.