DissociativeIdentityDisorder (DID), formerly known as MultiplePersonalityDisorder (MPD), is also referred to as dissociative personality disorder in some publications. It is a type of psychological disorder that is classified in the Diagnostic and Statistical Manual of Mental Disorders (DSM) as an Axis I dissociative disorder. Diagnosis requires a thorough physical and psychiatric examination, including a specific examination for dissociative phenomena. The psychiatrist may also attempt to contact and eliminate other personalities by asking the patient to talk to a part of the consciousness that involves behaviors that the patient has forgotten or has experienced in a depersonalized or non-realistic manner, Diagnostic criteria: American Diagnostic andStatisticalManual of Mental Disorders (4th edition) ( The diagnostic criteria for DID in the Diagnostic and Statistical Manual of MentalDisorder (DSM 1V) are as follows: 1. The presence of two or more distinct identities or personality states (each with its own relatively enduring perceptions, connections, and ways of thinking about the environment and oneself). 2. At least two identities or personality states repeatedly control the patient’s behavior. 3. The inability to recall important personal information to an extent that cannot be explained by the usual amnesia. 4. The impairments are not due to the direct physiological effects of the substance (e.g., temporary loss of consciousness or confused behavior in alcohol intoxication) or to a general medical condition (e.g., complex partial seizures).