DISC assessments are behavioral self-assessment tools based on the 1928 DISC emotional and behavioral theory of psychologist William Moulton Marston. The tools are designed to predict job performance. However, the scientific validity of DISC has been contested and is by some considered to be a pseudoscience.DISC is an acronym, the theory describing personality through four claimed central traits: dominance, inducement, submission, and compliance. Types The first self-assessment based on Marston's DISC theory was created in 1956 by Walter Clarke, an industrial psychologist. In 1956, Clarke created the Activity Vector Analysis, a checklist of adjectives on which he asked people to indicate descriptions that were accurate about themselves. This self-assessment was intended for use in businesses needing assistance in choosing qualified employees. Merenda, Peter F., and Clarke published their findings on a new instrument in the January 1965 issue of the Journal of Clinical Psychology. Instead of using a checklist, the "Self Description" test asks respondents to make a choice between two or more terms. "Self...