DISC Personality Tests

This methodology was devised by an American psychologist (and Professor at Columbia) William Moulton Marston in the 1920s in his book "Emotions of Normal People". He was also the co-creator of Wonder Woman, a character devised especially to add a woman to the comic books super-heroes and based her on his wife and co-creator Elizabeth.

D - Dominance
I - Influence or Inducement
S - Steadiness or Submission
C - Compliance

The DISC personality tests use selection of words to identify the four factors. E.g. typical words include stubborn, bold, competitive, domineering, courageous are D words, Persuasive, attractive, charming are I words, Gentle, loyal, obliging, even-tempered are S words and Modest, co-operative, open-minded, precise are C words. Typically there are 24 sets of words, where each word is indicative of a trait and the respondent filling in the questionnaire chooses one word in each set that is most relevant to him and one that is least.

It is accepted that the disc model is reasonably valid as a conceptual model of human traits and reliable because it is a partially ipsative measure rathan than a fully ipsative instrument. Ipsativity is a statistical term defined by "A set of measurement scales is said to be ipsative when the sum (or mean) of the scores obtained across the scales for each person is a constant."

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DISC Personality Tests