The DISC Psychological Scale is a model for understanding human behavior and personality traits. It was developed by psychologist William Moulton Marston and is based on the idea that there are four primary styles of behavior: Dominance (D), Influence (I), Steadiness (S), and Conscientiousness (C). These styles are believed to be related to an individual's natural tendencies and can be used to predict how a person will respond in different situations. Prior to this, this kind of work was mainly limited to the study of mentally ill or mentally abnormal people, but Dr. Maston hoped to expand the scope of this research to apply to the general, mentally healthy population. Therefore, Dr. Maston built his theory into a system called "The Emotions of Normal People." In order to test his theory, Dr. Maston needed to use some kind of psychological assessment to measure people's emotional responses - "personality traits." Therefore, he adopted four personality traits that he considered to be very typical: Dominance, Influence, Steady, and Compliance. DISC represents the initials of these four English words. In 1928, Dr. Maston presented the DISC assessment and theory in his book "The Emotions of Normal People." Currently, the DISC theory has been widely used in the recruitment of talent in the world's top 500 companies. It has a long history, strong professionalism, and high authority.