Other ways of sorting personality types

Human beings have for long attempted to describe and explain how they can be so different from each other:

Galen in the second century CE publicised Hippocrates’s belief that differences in human moods come as a consequence of imbalances in one of the four bodily fluids: blood, yellow bile, black bile, and phlegm. An imbalance of each humour corresponded with a particular human temperament (blood-sanguine, black bile-melancholic, yellow bile-choleric, and phlegm-phlegmatic). Individuals with sanguine temperaments are extroverted and social. Choleric people have energy, passion and charisma. Melancholics are creative, kind and considerate. Phlegmatic temperaments are characterized by dependability, kindness, and affection.
Almost every culture has believed that the position of the stars influences human events and the idea that their position at the time of our birth influences our personality is the oldest form of personality typing. In astrology, as with humours, the elements of earth, air, fire and water create subdivisions of personality types.

choleric	Yellow bile	Fire	Aries, Leo, and Sagittarius	Action orientated
melancholic	Black bile	Earth	Taurus, Virgo, Capricorn	Common sense
sanguine	Blood	Air	Gemini, Libra, Aquarius	Thinking and communication skills
phlegmatic	phlegm	Water	Cancer, Scorpio, Pisces	Ability to feel and intuitively know

Carl Jung’s interest in personality types emerged from his attempt to reconcile the differences between the psychological approaches of Freud and Adler. He concluded their conflict arose because of their different personality type (Freud’s theory was extraverted and Adler’s introverted). His book Psychological Types is the basis of Myers Briggs approach.
Among a number of contemporary approaches to personality typing, the Enneagram is popular. It has 9 basic types: Reformer, Helper, Achiever, Individualist, Investigator, Loyalist, Enthusiast, Challenger and Peacemaker. (Wikipedia has a useful table describing these). In spite of unease in the Vatican, this method for learning more about ourselves is widely used in Retreat Centres.