DISC assessments are behavioral self-assessment tools based on psychologist William Moulton Marston's DISC emotional and behavioral theory, first published in 1928. These assessments aim to improve job performance by categorizing individuals into four personality traits: dominance, inducement, submission, and compliance. However, the scientific validity of DISC has been a subject of debate, with some considering it to be a pseudoscience. Critics question its reliability and accuracy in predicting job performance. The theory proposes four central traits to describe personality, but its scientific basis remains contested. History The DISC personality theory was first outlined in the book "Emotions of Normal People", published in 1928, and written by William Moulton Marston, with likely contributions by Olive Byrne and Elizabeth Holloway Marston. 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...