Identify the concept that is shared by Sigmund Freud and Erik Erikson

Adoption History: Sigmund Freud (1836-1939)

Jul 11, 2007 ... Sigmund Freud, the famous Viennese architect of psychoanalysis, ... Erik Erikson's concepts of “identity” and “identity crisis” were among the most widely ... All parties to adoption, in other words, shared some form of ...
http://pages.uoregon.edu/adoption/people/SigmundFreud.htm

Child development - Wikipedia, the free encyclopedia
Erikson, a follower of Freud's, synthesized both Freud's and his own theories to ... Sigmund Freud developed a psychosexual theory of human development from infancy onward, ... Another useful concept for developmentalists is the attractor state, ... For example, in Erikson's discussion of stages of personality, ...
http://en.wikipedia.org/wiki/Child_development