The purpose of the Myers-Briggs Type Indicator (MBTI) personality inventory is to make the theory of psychological types described by C. G. Jung understandable and useful in people's lives. The essence of the theory is that much seemingly random variation in the behavior is actually quite orderly and consistent, being due to basic differences in the ways individuals prefer to use their perception and judgment.
The DiSC personality assessment is a tool that measures four observable behaviors in humans: dominance, influence, steadiness, and conscientiousness. It is used to improve communication, teamwork, and productivity in the workplace by providing a common language and reducing conflict. It can also help match people's profiles and personalities with a particular job or role.
-Intercultural Development Inventory