This document provides biographical information about American playwright Eugene O'Neill and analyzes his play Mourning Becomes Electra. It notes that Mourning Becomes Electra explores Freud's theory of the Oedipus complex through its characters. Specifically, it examines how the play depicts the Oedipus complex between Christine and her son Orin, as well as Lavinia's relationship with her father, as turning points in the development of their Oedipus and Electra complexes. The document concludes by discussing Freud's theory that the mind consists of conscious, preconscious, and unconscious systems, as relevant to O'Neill's interpretation of psychoanalysis in the play.