What is the name of Ingham and Luft's model and theory which deals with hidden and open areas of knowledge about a person?

The Johari window is a technique that helps people understand the relationship with others as well as with theirself. It was developed by two psychologists, Joseph Luft and Harrington Ingham.

The Johari window is a technique created in1955 by two American psychologists, Joseph Luft (1916–2014) and Harrington Ingham (1914–1995),