Solution:One precondition for personal effectiveness is better self-awareness. But only understanding one's self does not make a person effective. One simple model for self-awareness, which is widely used, is the Johari Window, developed by Luft and Ingham.
In this model, there are two main dimensions for understanding the self-the aspects of a person's behaviour and style that are known to him (self) and those that are known to people with whom he interacts (others).
A combination of these two dimensions reveals four areas of knowledge about the self (Figure). The upper left-hand square is the arena or the public self-a part of an individual's behaviour known both to himself and to others.
The arena includes information such as name, age, physical appearance and familial or organisational affiliation. The blind area contains the aspects of the person's behaviour and style that are known to others but the person himself does not know about.
A person may have mannerisms of which he is unaware but which are perceived by others as funny, annoying or pleasing.
For example, an individual might be surprised to hear that his method of asking questions annoys others who may interpret them as cross-examination rather than curiosity or a request for information.

The closed area involves the behavioural traits known to the person but not revealed to others; things in this area are secret. For example, a subordinate may be annoyed if his supervisor does not ask him to sit down during a meeting, but he will remain standing without letting the supervisor know that he is annoyed.
The supervisor may think that the subordinate does not mind standing and may accept his behaviour as part of their hierarchical relationship. Most of us have many such feelings in our closed areas that we are unwilling to reveal to the persons concerned.
The fourth area is the dark area, inaccessible to both the self and others. Some psychologists believe that this is a very large area indeed, and that certain circumstances (for example, an accident), a particular stage of one's life or special techniques such as psychoanalysis or psychodynamics may suddenly make a person realise some hidden aspects of himself.
Because the dark area cannot be consciously controlled or changed, this discussion will be limited to the arena, the blind and the closed areas. In the Johari Window model, the size of the arena or open space is critical for personal effectiveness. Arena increases in proportion to the decrease in the blind and the closed areas.