This document provides information about personality types and the Myers-Briggs Type Indicator (MBTI) assessment. It discusses how Carl Jung created typological theory and how Isabel Briggs Myers developed the MBTI questionnaire. It then covers the four dichotomies measured by the MBTI (Extraversion/Introversion, Sensing/Intuition, Thinking/Feeling, Judging/Perceiving), describes each of the 16 personality types, and explains how the types prefer to use their dominant, auxiliary, tertiary and inferior cognitive functions.