The Johari window is primarily intended as a group reflective activity. You choose from a list of adjectives ones that you believe accurately describe you. Your peers also choose from the same list an equal number of adjectives that they believe accurately describe you. You then analyse the similarities and differences between the adjectives chosen (and not chosen) by yourself and others to sort them into four quadrants.
Arena — adjectives chosen by you and by others. This represents the public you — known to self and to others. This could represent your authentic social self or the self you like to present to others (masking).
Façade — adjectives chosen by you and not by others. This represents the concealed you — know to self and not others. This could represent aspects of yourself that you do not reveal or possibly deluded self-perceptions (especially if you think these aspects of yourself should be obvious to others).
Blind spot — adjectives chosen by other and not by you. This represents the oblivious you — known to other and not you. This could represent aspects of yourself that you are denying or misconceptions of you by others.
Unknown — adjectives not chosen by you or others. This represents irrelevant characteristics or potential characteristics that no-one recognises yet.
As well as using the window to categorise personal attributes, you could use it to compare and categorise other things perceived by yourself and others within a specific situation, such as:
Meaning schema components — details within a situation noticed or ignored (remembered or forgotten), language used to describe a situation, comparators used to evaluate the the importance or salience of factors in the situation, categories used to recognise similarities and differences, patterns and connections between things, explanations and predictions made
Contextual factors — how you and others perceived the environment in which something happened
VITAE factors — effects, actions, thoughts/beliefs, intentions, values