Dr. William Moulton Marston was the creator of DISC Theory at Harvard University in the 1920’s, while doing research for his book The Emotions of Normal People. He was looking to identify predictable traits and behaviors of every day people in different environments. DISC styles are a combination of four behavioral personality types.

D = Drive
I = Influence
S = Steadiness
C = Compliance
These styles are not black and white. We have some level of each of these styles in our personality. It’s just a matter of what combinations are high or low. A high level of dominance predicts our behavior in the same way a low level of dominance does, so intensity does matter. When analyzing a person’s personality style, we look at which combinations are highest; also taking into account how high or low each style is on the graphs.