1928: Marston's behavioral model
DISC began with a behavioral model proposed by American psychologist William Moulton Marston in his 1928 book Emotions of Normal People. He suggested four behavioral tendencies depending on whether a person sees their environment as favorable or unfavorable, and whether they feel stronger or weaker than it. Those four are today's D, I, S and C.
Marston is also known for lie-detection research and for creating the comic Wonder Woman. But he never built a DISC questionnaire himself.
How it became a test
From the mid-20th century, various researchers and companies wrote questions based on Marston's model and turned them into tests. That's why there are many tests called "DISC," each with different questions and scoring. The theory itself is public knowledge; specific test products are trademarks of their companies. DISCTALK is independent and wrote its own questions.
What DISC can do
Helps you say things like "I work best hearing the conclusion first."
Lets you talk about differences as tendencies, not blame.
Helps a group agree up front on what to be careful about.
Shows what happens when a strength is overused.
What DISC can't do
- It doesn't explain your whole personality. Values, intelligence, ability and mental health are outside its scope.
- It can't be used to select people. Not for hiring, promotion, evaluation or diagnosis.
- Results can change. Mood, the situation you picture, and who you want to be all mix in. A short 20-question test like DISCTALK shifts more easily near boundaries.
- It can sound true for anyone. Instead of fitting yourself to a plausible description, sort out which parts actually fit.
Where the four axes came from
Marston split how people respond to their environment into two questions: is the environment on my side, and am I stronger than it? Feeling stronger than a tough environment leads to pushing ahead (Dominance); stronger in a friendly one, to drawing people in (Influence); adapting in a friendly one, to steadiness (Steadiness); adapting in a tough one, to keeping standards (Conscientiousness).
Today's DISC names and descriptions are plain-language versions of this structure, which is why each test words the four axes a little differently.
Common questions
Is DISC scientifically validated?
DISC is an old behavioral model, and each test differs in questions and validation. DISCTALK is not a validated psychometric instrument; it's a tool for self-understanding and conversation.
How is it different from MBTI?
MBTI looks at preferences in how you think and decide; DISC looks at observable behavior. See the DISC vs MBTI article for more.
Where did DISCTALK's questions come from?
We wrote them ourselves. How they were made and how scores are calculated is all in "How the DISCTALK test works."