DISC is a group of psychometric tests based on the 1928 work of psychologist William Moulton Marston.
DISC is the four quadrant behavioral model based on the work of William Moulton Marston Ph.D. (1893 - 1947) to examine the behavior of individuals in their environment or within a specific situation. DISC looks at behavioral styles and behavioral preferences.

The tests classify four aspects of personality by testing a person's preferences in word associations. DISC is an acronym for:

• Dominance - relating to control, power and assertiveness
• Influence - relating to social situations and communication
• Steadiness (submission in Marston's time)- relating to patience, persistence, and thoughtfulness
• Conscientiousness (or caution, compliance in Marston's time) - relating to structure and organization

These four dimensions can be grouped in a grid with D and I sharing the top row and representing extroverted aspects of the personality, and C and S below representing introverted aspects. D and C then share the left column and represent task-focused aspects, and I and S share the right column and represent social aspects. In this matrix, the horizontal dimension represents a factor of "Assertive" or "Passive", while the vertical represents "Open" vs. "Guarded".

• Dominance: People who score high in the intensity of the 'D' styles factor are very active in dealing with problems and challenges, while low D scores are people who want to do more research before committing to a decision. High "D" people are described as demanding, forceful, egocentric, strong willed, driving, determined, ambitious, aggressive, and pioneering. Low D scores describe those who are conservative, low keyed, cooperative, calculating, undemanding, cautious, mild, agreeable, modest and peaceful.

• Influence: People with High I scores influence others through talking and activity and tend to be emotional. They are described as convincing, magnetic, political, enthusiastic, persuasive, warm, demonstrative, trusting, and optimistic. Those with Low I scores influence more by data and facts, and not with feelings. They are described as reflective, factual, calculating, skeptical, logical, suspicious, matter of fact, pessimistic, and critical.

• Steadiness :( Submission in Marston's time): People with High S styles scores want a steady pace, security, and don't like sudden change. Low S intensity scores are those who like change and variety. High S persons are calm, relaxed, patient, possessive, predictable, deliberate, stable, consistent, and tend to be unemotional and poker faced. People with Low S scores are described as restless, demonstrative, impatient, eager, or even impulsive.

• Conscientious: (Compliance in Marston's time): Persons with High C styles adhere to rules, regulations, and structure. They like to do quality work and do it right the first time. High C people are careful, cautious, exacting, neat, systematic, diplomatic, accurate, and tactful. Those with Low C scores challenge the rules and want independence and are described as self-willed, stubborn, opinionated, unsystematic, arbitrary, and careless with details.