The Personality Type Test is based on the work of C. G. Jung, the Swiss psychiatrist. In essence, Jung stated that every personality must have three things:
- A way of perceiving the world (either through sensation or intuition)
- A way of making decisions (judgments) based on those perceptions (either through thinking or feeling)
- An attitude with which to approach the world (either introverted or extraverted)
All of the classical 16 types are based on those three things and which aspects are predominant in any personality. This test tells you how you scored on the four scales: extraversion vs. introversion (E or I), intuition vs. sensation (N or S), thinking vs. feeling (T or F), perception vs. judgment (P or J). In other words, this test tells you which aspects of your personality are the most developed and refined and which aspects are your most natural tendencies. Suggested careers are based on these strengths. In terms of your growth as a person, it is also useful to use the test to think about which aspects of your personality are underdeveloped and may need work in the future as you mature as a person, because all of the aspects of your personality are important. Different situations in life inevitably call for different functions.
In terms of percentages of the American population, it is generally thought that extraverts outnumber introverts 75% to 25%. Thinking Types and Feeling Types are thought to be evenly distributed (50-50), whereas Sensation Types (75%) are thought to be more common than Intuitive Types (25%). People favoring Perception or Judgment are about even (50-50). The individual percentages given for the 16 types are based on the combination of those percentages in each individual type. Evenly distributed, each of the 16 types would be a little better than 6% of the population.
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