A framework dividing information about oneself into four quadrants in an overall grid, mapping what other people do and do not know about me against what I know and do not know about myself. These quadrants consist of: open or public information about myself, that which is hidden and known to me alone, that to which I am blind but which others notice, and that which is currently unknown to me or others but which may later become apparent. Self-disclosure enlarges the ‘open’ area and decreases the others. The solicitation of feedback reduces what I do not know about myself. The term for this disclosure/*feedback model of self awareness comes from the combination of the names of the concept's two originators: Joe Luft and Harry Ingham, who devised the framework in 1955. It is often used to assist people to understand and improve their interpersonal communication and relationships.
http://www.noogenesis.com/game_theory/johari/johari_window.html Johari window