Myers–Briggs Type Indicator
The Myers–Briggs Type Indicator (MBTI) is a pseudoscientific self-report questionnaire that claims to indicate differing "psychological types". The test assigns a binary value to each of four categories: introversion or extraversion, sensing or intuition, thinking or feeling, and judging or perceiving. One letter from each category is taken to produce a four-letter test result representing one of sixteen possible types, such as "INFP" or "ESTJ".
Katharine Cook Briggs and Isabel Briggs Myers extrapolated their MBTI theory from Carl Jung's writings in his 1921 book Psychological Types
Katharine Cook Briggs was an American writer who was the co-creator, with her daughter Isabel Briggs Myers, of an inventory of a widely popular personality type system known as the Myers–Briggs Type Indicator (MBTI).
Briggs in the early 20th century
Cook (left) with her daughter Isabel in an early 20th century photograph