Is DiSC valid? The research behind Everything DiSC®
DiSC is easy to remember, but the assessment behind Everything DiSC® is serious. Its reliability is published, it adapts to each person’s answers, and it is independently certified. Here is the evidence, and its limits, in plain language.
The short answer: yes
How Everything DiSC® measures behaviour
Older DISC tests use a fixed questionnaire and four scales. Everything DiSC® uses computerised adaptive testing and eight scales arranged on a circle, which is why it can describe 12 blended styles instead of a single letter.
Questions
People rate statements about how they behave at work.
Consistency check
If answers on a scale don’t agree, the assessment notices.
Extra questions
It asks more on exactly those scales, so the result is precise.
Eight scales
Scores on eight scales place the person on the DiSC circle.
Personal report
A dot, a style and priorities, written into about 20 pages.
Where DiSC comes from, and what it measures
The model goes back to psychologist William Moulton Marston, who described four patterns of emotion and behaviour in his 1928 book Emotions of Normal People. The first DiSC assessment was published in the 1970s by the company that is now part of Wiley, and Wiley has researched the model ever since. Everything DiSC® measures eight scales and places each person in one of 12 styles on the circle, because most people are a blend of two neighbouring styles.
Everything DiSC® also measures priorities separately from the style, such as results, enthusiasm or accuracy. That is why two people with the same style can still get different reports. DiSC describes behaviour; it does not prescribe it.
Is DiSC reliable?
Reliability tells you whether an assessment measures consistently. Researchers usually treat .70 as the minimum. Every Everything DiSC® scale is well above it, both within one sitting and when people retake the assessment two weeks later.
Research threshold .70. Ranges drawn to scale; higher is more reliable. Source: Wiley research report for the adaptive testing assessment, 2020.
Is DiSC scientifically validated?
Reliability shows that results are consistent. Validity shows that they mean what they say. Wiley has tested this in several ways, and the results are published.
The structure holds
Neighbouring scales correlate positively and opposite scales negatively, as the model predicts. Multidimensional scaling and factor analysis confirm the circular structure.
Checked against established tests
Two independent agencies compared Everything DiSC® with two of the most respected personality inventories to establish construct validity.
Observers see the same thing
In a study of leadership behaviour rated by observers, the expected DiSC style scored highest on 71% of practices and was in the top two on 88%.
People recognise themselves
Participants rate their style description as good or excellent about 90% of the time. Agreement alone is not proof, which is why the studies above matter.
Why the adaptive version is more precise
When answers on a scale are inconsistent, Everything DiSC® asks follow-up questions on exactly that scale. In Wiley’s construct validity analysis, the adaptive assessment measured 32% more accurately than DiSC® Classic. Three or more priorities can appear in a report, so results also reflect people who do not fit the average for their style.
“Essentially an altogether different type of assessment.”
EFPA test review of Everything DiSC® Workplace, 2020, comparing it with traditional four-scale DISC tests
Before anything is released
- About 14,000 participants in three rounds of beta testing for a recent profile
- 250 facilitators involved
- 235 in-depth interviews
- 3,800+ survey responses read
- Profiles, facilitation kits and translations are all beta tested before launch
Independently reviewed and certified
Everything DiSC® Workplace was reviewed against the Test Review Model of the European Federation of Psychologists’ Associations (EFPA) and certified by DNV, an accredited certification body, in 2020. The certification was renewed on 2 January 2024 for five years. EFPA writes the standard; it does not approve tests itself. The certification covers Everything DiSC® Workplace as an occupational test for development.
What DiSC is designed for, and what it is not
Use Everything DiSC® for
- Self-awareness and personal development
- Team development and communication
- Management and leadership development
- Sales and customer conversations
- Onboarding and coaching
Don’t use it for
- Hiring and selection decisions
- Predicting job performance
- Measuring intelligence, values or ability
- Labelling people or deciding who fits a team
For hiring, use an assessment built for selection. The EFPA review says the same: Everything DiSC® Workplace is for development.
Questions about the research
Is DiSC valid and reliable?
Yes. Everything DiSC® scales show a median internal consistency of .87 and test-retest reliability of .85 to .88, above the .70 research threshold, and validity studies confirm the model’s circular structure. Everything DiSC® Workplace is certified by DNV to the EFPA test-quality standard.
Is DiSC scientifically validated?
Everything DiSC® publishes its validation research: factor analysis and multidimensional scaling, comparisons with the NEO PI-R and 16PF, and observer studies. Free online DISC quizzes usually publish no such research.
How accurate is the Everything DiSC® assessment?
Its scales have a median internal consistency of .87 and test-retest reliability of .85 to .88. The adaptive version measured 32% more accurately than DiSC® Classic in Wiley’s construct validity analysis.
Is Everything DiSC® approved by EFPA?
EFPA writes the test-review standard; it does not approve tests. Everything DiSC® Workplace was reviewed against the EFPA Test Review Model and certified by DNV, an accredited certification body.
How is Everything DiSC® different from other DISC tests?
Most DISC tests use a fixed questionnaire with four scales. Everything DiSC® uses adaptive testing and eight scales on a circle, which gives a more precise position, 12 blended styles and personal priorities.
Can we use DiSC to select candidates?
No. DiSC is designed for development and is not validated for selection. For hiring decisions, use an assessment built for that purpose.
Does a DiSC style change over time?
Basic style is fairly stable, which the test-retest results show. It can shift with experience and role over longer periods, so there is usually no need to retake the assessment within two years.
How does DiSC compare with MBTI?
DiSC describes observable workplace behaviour; MBTI describes personality preferences. See DiSC vs MBTI for a full comparison.
Sources
Need the evidence for a decision?
If your HR team, works council or a psychologist wants to review the research before you decide, tell us what they need. We’ll send the reports and answer their questions.