Johari Window is a model used for people to know themselves and others better through adjectives. This model includes four quadrants; one of these is the hidden self that should include features you know about yourself but other people ignore. This process involves self-disclosure because you disclose information about yourself such as qualities, feelings, fear, etc. Additionally, once you began disclosing this information the Hidden Self window shrinks because less information about you is hidden and this makes the Open self to expand (information about you that is known by you and other people). Thus, it is the Hidden Self quadrant the one that shrinks through self-disclosure.
