Explanation:

The Johari Window model is a simple and useful tool for illustrating and improving self-awareness, and mutual understanding between individuals within a group. This model can also be used to assess and improve a group's relationship with other groups. It was devised by American psychologists Joseph Luft and Harry Ingham in 1955, while researching group dynamics at the University of California Los Angeles. The model was first published in the Proceedings of the Western Training Laboratory in Group Development by UCLA Extension Office in 1955, and was later expanded by Joseph Luft. Today the Johari Window model is especially relevant due to modern emphasis on, and influence of, 'soft' skills, behaviour, empathy, cooperation, inter-group development and interpersonal development.