Origin of the DISC
This DISC is the most contemporary interpretation of Dr. William Marston’s groundbreaking work into understanding and measuring a person’s natural behavioral style. Dr. William Marston, a physiological psychologist, shared his theory in his book Emotions of Normal People, published in 1928. He did not create an assessment instrument from his theory. However, based on his model, others have created DISC assessments. That's why you might discover other DISC tests in the marketplace.