The document discusses the Myers-Briggs Type Indicator (MBTI) assessment, which measures psychological preferences in how people perceive the world and make decisions. The MBTI assessment was developed based on Carl Jung's theories of psychological types. It measures preferences on four dichotomies: Extraversion vs Introversion, Sensing vs Intuition, Thinking vs Feeling, and Judging vs Perceiving. The document also provides information on the 16 personality types identified by the MBTI, applications of the MBTI in different fields, and certification to use the MBTI assessments.