1. The purpose of the Myers-Briggs Type Indicator is to help people understand themselves and their relationships with others. 2. There are 16 personality types. 3. The four dichotomies used in the MBTI are: Extroversion vs. Introversion, Sensing vs. Intuition, Thinking vs. Feeling, Judging vs. Perceiving. 4. ESTJ stands for Extroversion, Sensing, Thinking, Judging. 5. An ESTJ personality type is described as organized, practical, realistic, and decisive.