1. The Myers–Briggs Type Indicator
2. Four dichotomies
3. Dominant function
4. Judging vs. perception
5. Concepts
7. Myers-Briggs Type Indicator® assessment

1. The Myers–Briggs Type Indicator (MBTI) is an introspective self-report questionnaire designed to indicate psychological preferences in how people perceive the world and make decisions.
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3. The MBTI was constructed by Katharine Cook Briggs and her daughter Isabel Briggs Myers. 
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5. It is based on the typological theory proposed by Carl Jung, who had speculated that there are four principal psychological functions by which humans experience the world – sensation, intuition, feeling, and thinking – and that one of these four functions is dominant for a person most of the time.
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7. The MBTI was constructed for normal populations and emphasizes the value of naturally occurring differences. 
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9. "The underlying assumption of the MBTI is that we all have specific preferences in the way we construe our experiences, and these preferences underlie our interests, needs, values, and motivation."
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11. Although popular in the business sector, the MBTI exhibits significant psychometric deficiencies, notably including poor validity (i.e. not measuring what it purports to measure) and poor reliability (giving different results for the same person on different occasions).
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13. The four scales used in the MBTI have some correlation with four of the Big Five personality traits, which are a more commonly accepted framework. 
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2  Four dichotomies

The four pairs of preferences or dichotomies are shown in the adjacent table.

1. Note that the terms used for each dichotomy have specific technical meanings relating to the MBTI which differ from their everyday usage.
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3. For example, people who prefer judgment over perception are not necessarily more judgmental or less perceptive. 
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5. Nor does the MBTI instrument measure aptitude; it simply indicates for one preference over another.  
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7. Someone reporting a high score for extraversion over introversion cannot be correctly described as more extraverted: they simply have a clear preference.

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3   Dominant function

A diagram depicting the cognitive functions of each type. A type's background color represents its dominant function and its text color represents its auxiliary function.

1. According to Jung, people use all four cognitive functions. 
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3. However, one function is generally used in a more conscious and confident way. 
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5. This dominant function is supported by the secondary (auxiliary) function, and to a lesser degree the tertiary function. 
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7. The fourth and least conscious function is always the opposite of the dominant function. 
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9. Myers called this inferior function the shadow.

The four functions operate in conjunction with the attitudes (extraversion and introversion). Each function is used in either an extraverted or introverted way. A person whose dominant function is extraverted intuition, for example, uses intuition very differently from someone whose dominant function is introverted intuition.