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DISC is a behavior assessment tool based on the DISC theory of psychologist William Moulton Marston, which centers on four different behavioral traits: dominance, inducement, submission, and compliance. This theory was then developed into a behavioral assessment tool by industrial psychologist Walter Vernon Clarke.
There are many versions of the questionnaire and profile. Because the versions of the assessment do vary, practitioners are cautioned to ask for evidence for the validity of a prospective version before using it.