After more than fifty years of research and development, the MBTI is the most widely used instrument for understanding normal personality differences. More than three million MBTIs are administered each year in the U.S. alone.  It is used in

	Team building
	Self-understanding and development
	Career exploration, development, and counselling
	Organisation development
	Improving problem solving
	Management training
	Leadership development

Isabel Briggs Myers and Katherine Cook Briggs began developing the MBTI in the early 1940s to make C. G. Jung's theory of human personality understandable and useful in everyday life.

MBTI results indicate the respondent's likely preferences on four dimensions:

	Extraversion (E) OR Introversion (I)
	Sensing (S) OR Intuition (N)
	Thinking (T) OR Feeling (F)
	Judging (J) OR Perceiving (P)

Results on the Indicator are generally reported with letters representing each of the preferences as indicated above.

There are 16 possible ways to combine the preferences, resulting in 16 MBTI types:

ISTJ, ISTP, ESTP, ESTJ, ISFJ, ISFP, ESFP, ESFJ, INFJ, INFP, ENFP, ENFJ, INTJ, INTP, ENTP, and ENTJ.

Though many factors combine to influence an individual's behaviours, values, and attitudes, the four-letter type descriptions summarize underlying patterns and behaviours common to most people of that type.

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