Appendix B: All possible permutations of preferences for the four dichotomies above yield 16 different combinations.

The 16 personality types
ESTJ ISTJ ENTJ INTJ
ESTP ISTP ENTP INTP
ESFJ ISFJ ENFJ INFJ
ESFP ISFP ENFP INFP

Notes: E extraversion; I introversion; S sensing; N intuition; T thinking; F feeling.