Personality theory

The most common personality theory is the Meyers-Briggs model of temperament. The most widely consulted reference on this is Please Understand Me II by David Kiersey. The model can be understood easily. It is a series of questions designed to answer the following questions, in order:
  • do you gain energy from being around people, or do you find it draining? introvert vs extrovert (I vs E)
  • can you explain why you believe what you believe?intuitive vs sensory (N vs S)
    • if so, do you seek external justification from other people for what you believe, or inner feelings it is right? thinking vs feeling (T vs F)
    • if not, do you prefer to wait until the last moment for options to open or constraints to become clear, or do you prefer to make decisions and follow through? perceptive vs judging (P vs J)

A typical test asks about seventy questions designed to reveal these tendencies. The sixteen personality types that emerge are:
  • NT
    • INTJ
    • ENTJ
    • ENTP
    • INTP
  • NF
    • INFJ
    • INFP
    • ENFJ
    • ENFP
  • SP
  • ISTP
  • ISFP
  • ESTP
  • ESFP
  • SJ
  • ISTJ
  • ISFJ
  • ISTP
  • ISFP

Some of these types are more common than others. About 50% of all people in an industrial society are of the SJ types. Another 25% are of the SP types.