Twenty patients with dissociative identity disorder (DID), 20 with schizophrenic disorder, 20 with panic disorder, and 20 with complex partial epilepsy were evaluated with the Dissociative Disorders Interview Schedule (DDIS) and the Dissociative Experiences Scale (DES). Subjects with dissociative identity disorder were more frequently diagnosed as having somatization disorder, past or concurrent major depressive episode, borderline personality disorder, depersonalization disorder, and dissociative amnesia than other groups. They reported Schneiderian symptoms and extrasensory perceptions more frequently In their anamnesis suicide attempts, trance states, sleepwalking, and childhood traumas were more frequent than those in comparison groups. The secondary features of dissociative identity disorder and the DES score differentiated these patients from comparison groups significantly. DID has a set of clinical features different from that of schizophrenic disorder, panic disorder and complex partial epilepsy. The differences are similar to those yielded previously in studies from North America. Copyright (C) 1998 by W.B. Saunders Company.