This paper presents an overview of Multiple Personality Disorder, its development, epidemiology and etiology. It also presents a study of a case. The paper also stresses the criteria for diagnosis so professionals can identify cases at an early stage. Different treatment approaches are discussed. Multiple Personality Disorder (MPD) is a major dissociative reaction in which the patient leads two or more lives independentaly, usually alternating. Each personality seemingly possesses the ability

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... function independently and separately, one in a dominant position, while the other (or others) is kept submerged for a time. This reaction is the ultimate of dissociative progression. More than six thousand cases of MPD have been diagnosed in North America 1 and, since 1986, over 700 scientific articles, chapters, books, etc. have been published.