Enkele zeer belangrijk artikelen over het ontstaan van normen en waarden zijn te vinden op de website: www.clarewgraves.com

From Wikipedia:

Clare W. Graves (December 21, 1914-January 3, 1986) was a professor of psychology and originator of the Level Theory of Personality. He was born in New Richmond, Indiana.
Graves graduated from Union College in New York in 1940 and received his master's degree and a Ph.D in psychology from Western Reserve University in Cleveland, Ohio.

In the mid-twentieth century, Clare W. Graves taught psychology at Union College in Schenectady, New York. There he developed an epistemological model of human psychology. Graves claimed that the inspiration for so doing came from undergraduate students in his introductory psychology course. He acknowledged that he was unable to answer the frequently asked question as to who from among many competing psychology theorists was ultimately "right" or "correct" with their model since there were elements of truth and error in all of themů.