The International Society for the Study of Trauma and Dissociation (ISSTD) is a nonprofit professional organization of health professionals and individuals who are interested in advancing the scientific and societal understandings of trauma-based disorders, including posttraumatic stress disorder, complex posttraumatic stress disorder, and the dissociative disorders. The focus of the organization has broadened over the years. In the 1980s, the ISSMP&D, the International Society for the Study of Multiple Personality and Dissociation, grouped clinicians and researchers primarily interested in Multiple Personality Disorder (MPD). Dissociative Identity Disorder (DID) had been called MPD since the 19th century, and was still called MPD in DSM-II and DSM-III. In the 1990s, DSM-IV changed the name of MPD to DID, and so the ISSMP&D simplified its name to the ISSD (the International Society for the Study of Dissociation), broadening its interest to include the other dissociative disorders. By the 21st century, the ISSD had broadened its interest to include chronic developmental traumatic disorders (also known as Complex PTSD), and so the name was lengthened to ISSTD: the International Society for the Study of Trauma and Dissociation. Editors of the book Dissociation and the dissociative disorders: DSM-V and beyond describe the ISSTD as "The principle professional organization devoted to dissociation". More information...
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