Dissociative identity disorder (did), previously known as multiple personality disorder (mpd), is characterized by the presence of at least two personality states or alters. 路 dissociative identity disorder is an often misunderstood condition, but the tide is turning. Learn about the symptoms of did here. 路 dissociative identity disorder (did), previously known as multiple personality disorder, is a complex psychological condition caused by many things. Dissociative identity disorder (did) is a mental health condition where you have two or more separate personalities that control your behavior at different times. These include severe trauma during early. 路 dissociative identity disorder (did) is a rare condition in which two or more distinct identities, or personality states, are present in鈥攁nd alternately take control of鈥攁n individual.