“…Historically, Schneider's 'psychopathic types' (hyperthymic, depressive, insecure, fanatic, sensitive, attention-seeking, labile, asthenic, explosive and affectionless), together with Kretschmer's [7] schizoid and cyclothymic, have influenced much of the subsequent thinking in this area. As shown by Sass [8], the ICD-10 and DSM-IV definitions and classifications of personality disorders are largely derived from these concepts. It is important to note, however, that the original typologies were never intended by their authors to be diagnostic categories.…”