Dr. Eysenck, professor of psychology at the Institute of Psychiatry at the Maudsley Hospital in London, discusses its now classic criticisms of Freud and psychoanalysis. He explains behavior therapy (a phase he was the first to use) and discusses its increasingly widespread use. Dr. Eysenck's special use of factor analysis, his focus on introversion-extroversion, and his opinions about the men who have influenced him most are covered.