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The Johari window is a technique used to help people better understand their relationship with themselves and others, which was created by psychologists Joseph Luft (1916–2014) and Harrington Ingham (1916–1995) in 1955. It is used primarily in self-help groups and corporate settings as a heuristic exercise. Luft and Ingham called their Johari Window model 'Johari' after combining their first names, Joe and Harry.
During the exercise, subjects are given a list of a few adjectives out of which they need to pick some that they feel describe their own personality. The subject's peers are then given the same list, and each pick equal number of adjectives that describe the subject. These very adjectives are then inserted into a grid.
The philosopher Charles Handy calls this concept the Johari House with four rooms. Room 1 is the part of ourselves that we see and others see. Room 2 is the aspects that others see but we are not aware of. Room 4 is the most mysterious room in that the unconscious or subconscious part of us is seen by neither ourselves nor others. Room 3 is our private space, which we know but keep hiding from others.
Open or Arena: Adjectives that are selected by both the participant and his or her peers are placed into the Open or Arena quadrant. This quadrant represents traits of the subjects that both they themselves and their peers perceive.
Hidden or Façade: Adjectives selected only by subjects, but not by any of their peers, are placed into the Hidden or Façade quadrant, representing information about them their peers are either unaware of or that is not true but that they self-claim. It is then up to the subject to disclose this information or not, or it may be a delusion.
Blind: Adjectives that are not selected by subjects but only by their peers are placed into the Blind Spot quadrant. These represent information that the subject is not aware of, but others perceive, and they can decide whether and how to inform the individual about these "blind spots".
Unknown: Adjectives that were not selected by either subjects or their peers remain in the Unknown quadrant, representing the participant's behaviors or motives that were not recognized by anyone participating. This may be because they do not apply or because there is collective ignorance of the existence of these traits.
A Johari window consists of the following 56 adjectives used as possible descriptions of the participant. 
One therapeutic target may be the expansion of the Open (Arena) square at the expense of both the Unknown square and the Blind Spot square, resulting in greater knowledge of oneself, while voluntary disclosure of Private square may result in greater interpersonal intimacy and friendship.
- Luft, J.; Ingham, H. (1955). "The Johari window, a graphic model of interpersonal awareness". Proceedings of the western training laboratory in group development. Los Angeles: University of California, Los Angeles.
- Luft, Joseph (1969). Of Human Interaction. Palo Alto, California: National Press. p. 177.
- Staff (undated). "Johari Window". kevin.org. Retrieved 24 November 2014.
- Perry, P. (2010) Couch Fiction. pp. 123–124.
|Wikimedia Commons has media related to Johari window.|
- Johari Window : Peeping into Oneself
- Noogenesis article on the Johari Window, Examples of window-altering actions; game theory aspects.
- Online Johari Window tool, by Kevan Davis
- Luft, Joseph (1972). Einfuhrung in die Gruppendynamik. Klett.
- Hase, Steward; Alan Davies; Bob Dick (1999). The Johari Window and the Dark Side of Organisations. Southern Cross University.
- Handy, Charles (2000). 21 Ideas for Managers. San Francisco: Jossey-Bass. ISBN 0-14-027510-X.