Joseph Luft and Harry Ingham developed the Johari Window in 1955. The tool is a useful visual representation of a person's character, and is represented with a four-quadrant grid.
The goal of the Johari Window is to demonstrate the importance of open communication, and to explain its effect on group trust. The model also teaches you the importance of self-disclosure, and shows how group feedback can help you grow, both personally and professionally.
Your Open Area is expanded vertically with self-disclosure, and horizontally with feedback from others on your team. By encouraging healthy self-disclosure and sensitive feedback, you can build a stronger and more effective team.