Classifying personalities into four categories by personality typing. This test uses independent orthogonal types or scales: (1) Extroversion (E) vs. Introversion (I), (2) Sensing (S) vs. intuition (N), (3) Thinking (T) vs. Feeling (F), and (4) Judging (J) vs. Perceiving (P). Isabel Myers-Briggs of the US and her mother developed this method. Neither had any formal training in psychology. They based their approach on Austrian psychologist Carl Jung’s (1875-1961) personality types theory.
