DISC assessment DISC assessment DISC is a behavior assessment tool based on the DISC theory of psychologist William Moulton Marston, which centers on four different personality traits which are currently Dominance (D), Influence (I), Steadiness (S), and Conscientiousness (C). This theory was then developed into a behavioral assessment tool by industrial psychologist Walter Vernon Clarke. Marston was a lawyer and a psychologist; he also contributed to the first polygraph test, authored self-help books and created the character Wonder Woman. His major contribution to psychology came when he generated the DISC characteristics of emotions and behavior of normal people (at the time, 'normal'
William Moulton Marston pressure test, which became one component of the modern polygraph invented by John Augustus Larson in Berkeley, California. Marston's wife, Elizabeth Holloway Marston, suggested a connection between emotion and blood pressure to William, observing that, "[w]hen she got mad or excited, her blood pressure seemed to climb". Although Elizabeth is not listed as Marston's collaborator in his early work, Lamb, Matte (1996), and others refer directly and indirectly to Elizabeth's own work on her husband's research. She also appears in a picture taken in his laboratory in the 1920s (reproduced by Marston, 1938). Marston set out to commercialize Larson's invention