In 1928, Harvard psychologist William Marston published a treatise that changed the way the world viewed personality. Marston observed human personality existing along four unique dimensions, or traits. Marston’s four personality traits are referred to as the DISC model, which is an acronym for a person’s tendency to be Dominant, Interpersonal, Steady, or Conscientious. Though the DISC personality traits represent needs that are important to everyone to some degree, knowing which are most prevalent in any person is the key to understanding personality.

People high in the “Dominant” trait are direct and assertive. They think independently, are ambitious, and take a quick and active approach to solving problems. Dominants are competitive and enjoy a challenge, even when the odds are stacked against them. They have a strong need to achieve and try to maintain a measure of authority and control over the environment in which they live and work. Other people find Dominants determined and strong willed, which is no surprise, as Dominants like to have things done their way.

People high in the “Interpersonal” trait are entertaining and social. They like to participate in groups and rely on their social skills as the primary means for getting things done. Highly extroverted, these people are considered by others to be friendly and outgoing. They express their feelings and are generally more comfortable with emotions than others.

People high in the “Steady” trait are persistent and patient. They take a measured, stable approach to life and don’t like surprises. They are accommodating and undemanding, often showing intense loyalty to those around them. Steady people place a high value on sincerity; they habitually tell the truth and expect others to do the same. People tend to see Steady people as deliberate and consistent in their approach to life, which can lead to the label of being predictable. Steady individuals possess an unusual level of persistence, and can maintain their focus and interest in something longer than most others can.