The Johari Window model is a psychological framework for understanding interpersonal awareness and relationships. It was developed in the 1950s by American psychologists Joseph Luft and Harry Ingham. The model visualizes personal information as being divided among four categories: open self (known to self and others), blind spot (unknown to self but known to others), hidden self (known to self but unknown to others), and unknown (unknown to both self and others). The goal of the model is to increase the open self through self-disclosure and feedback between individuals and within groups. This allows for improved communication, cooperation, and overall team effectiveness.