This paper briefly introduces outlines of psychoanalysis (Freud), individual psychology (Adler), and analytical psychology (Jung). Freud focused on problems of adults as they related to childhood; Adler on problems of adults as they related to adulthood; and Jung on problems of adults as they related to middle and later years. Jungian analytical psychology is singularly applicable to the entire life cycle with special meanings for gerontology. In all this theorizing, however, we should always consider reality, and towards this end research is recommended. Included is a select bibliography with authorized translations of original sources, definitive sources, and explanatory sources. (Author)