Dissociative disorders are dysfunctions that cause disruption of memory, perception, identity, consciousness, etc. of a person. These disorders are also called derealization, a change that was made in the DSM-5. Additionally, another change for dissociative disorders in the DSM-5 is now dissociative amnesia and dissociative fugue is not considered to be distinct in diagnosis, but dissociative fugue is a feature of dissociative amnesia. Dissociative amnesia is the inability to remember important personal information (Barlow and Durand 2009). Dissociative fugue is the unexpected journey away from home or one's usual place of work (Barlow and Durand, 2011). Thesis Statement: Dissociative disorders come in many forms, but the focus will be on Dissociative Identity Disorder and Shirley Ardell Mason (also known as Sybil), highlighting her sixteen personalities . According to the Cleveland Clinic, “Dissociative disorders are mental illnesses that involve disturbances or disturbances. breakdowns of memory, consciousness, identity and/or perception. When one or more of these functions are disrupted, symptoms may occur. These symptoms can interfere with a person's overall functioning, including social activities, work functions, and relationships. This disorder is also known as multiple personality disorder, but this title suggests that a person can be more than one person, which is different from having multiple personalities. Additionally, dissociative traits appeared in a person diagnosed with multiple personality disorder, so the name change was necessary. These other identities, called subpersonalities or “alterations” (Barlow & Durand, 2011), effect a change with the original personality (the patient's personality). The original personality is, middle of paper, beyond traumatic events. Shirley Mason's treatment was therapy with her psychoanalysts. One of his personalities attempted suicide, so his doctor prescribed sodium pentothal for his anxiety. In the end, four of Shirley's personalities merged and formed a new, healed Shirley, and the others either disappeared or integrated into Shirley. Eventually, she was left with just one identity with the traits of her former sub-personalities, and she was finally able to live a normal life. DID is a serious disorder, due to the extremities and lack of control that can be experienced. Although the etiology is not entirely agreed upon, it can be assumed that this disorder arises from a traumatic experience. It is not guaranteed that a person will make a full recovery, but there is optimism in understanding that there is a possibility of full integration..