Myers Briggs theory is based on four psychological functions – Sensing, iNtuition, Thinking, and Feeling. They are used to perceive facts or possibilities, and make decisions using objective logic or subjective values. (The other letters of the Myers Briggs code – E, I, J and P – describe how those functions are used.)
Isabel Briggs Myers derived her theory from Psychological Types by C.G. Jung (Briggs Myers 1980, p. xvii). However, Jung’s book describes five psychological functions. The fifth, which he called the “transcendent function” (Jung 1921, p. 480), was the most important (Jung 1935). He also produced a paper on the transcendent function five years before publishing Psychological Types (Jung 1916/1957).
