Judgment involves all the ways of coming to conclusions about what has been perceived.
If people differ systematically in what they perceive and in how they reach conclusions, then it is only reasonable for them to differ correspondingly in their interests, reactions, values, motivations, and skills. The Myer's Briggs is based on Jung's ideas about perception and judgment, and the attitudes in which these are used in different types of people. The MBTI contains four separate indices. Each index reflects one of four basic preferences which, under Jung's theory, direct the use of perception and judgment. The preferences affect not only what people attend to in any given situation, but also how they draw conclusions about what they perceive.