The DiSC Personality Test is a very powerful tool to assess behavior. It was developed following the theories of William Moulton Marston, psychologist. Marston suggested that there are four specific personality traits, which are Dominance, Inducement, Submission and Compliance. Walter Vernon Clarke took this theory and developed it further, using it as a personality assessment tool.
Marston studied the emotions and behavior of normal people and their interaction with their environment. The research conducted by his contemporaries Jung and Freud had centered on the emotions of abnormal people. Marston developed the theory to explain model of human behavior and people’s emotional responses to various stimuli; but he did not create an assessment tool.