By: Mitch Reitman, Retiman Consulting
The Dunning–Kruger effect describes a pattern in which people with low skill or knowledge within a domain overestimate their abilities, while those with high competence may underestimate theirs. This cognitive bias, first identified by psychologists David Dunning and Justin Kruger in 1999, highlights how limited expertise can impair self‑awareness and lead to inflated self‑confidence.
At its core, the Dunning–Kruger effect reflects a mismatch between perceived ability and actual ability. People who lack skill often don’t know enough to recognize their own mistakes or limitations. As a result, they may believe they are performing far better than they are. Conversely, highly skilled individuals may assume tasks that feel easy to them are also easy for everyone, causing them to undervalue their own competence.
Dunning and Kruger demonstrated this effect through experiments measuring participants’ abilities in logic, grammar, and humor. Those who scored in the lowest quartile consistently rated themselves far above average. In one example, participants in the 12th percentile believed they were performing around the 62nd percentile—an enormous gap between confidence and reality.
Their findings showed that metacognition—the ability to evaluate one’s own thinking—requires a certain level of competence. Without that baseline, people struggle to judge their own performance accurately.
Why it happens
Several psychological mechanisms contribute to the effect:
- Lack of knowledge prevents self‑assessment — People who don’t understand a subject also don’t know what they don’t know.
- Overconfidence fills the gap — In the absence of accurate self‑evaluation, people rely on intuition or assumptions.
- Misinterpretation of ease — Beginners may mistake initial exposure for mastery, while experts may forget how much they’ve learned.
- Social comparison errors — People often compare themselves to others without reliable benchmarks.
The Dunning–Kruger effect commonly appears in workplace performance. Managers may believe that they know everything and not be willing to listen to others. Employees may overrate their skills, resist feedback, or take on tasks they’re not prepared for. The common thread is people who fall into these categories often assume competence in areas they rarely evaluate objectively.
How should you address it as an individual?
Consider yourself an experienced student who has a constant need to learn. Whether it be manufactures training, third party training services, or participating in state and local level associations – all offer quality training, and most are free. Attend some of the industry conferences, not just for the free stuff, and check out the training and product demonstrations.
Dunning-Kruger didn’t just address overconfidence, it also found that the most knowledgeable people who were more capable generally rated themselves lower than they were. They assumed that others were as, or more, confident than they were. If you are good at something, share your knowledge and expertise. Others want to learn.
Mitch Reitman is Managing Principal of Reitman Consulting Group, Inc. He is a member of the Electronic Security Industry Hall of Fame, and is active in numerous State and Local associations. He can be reached at Mreitman@Reitman.US.
Internal Links URLs
https://security.world/cognitive-bias-security
External Links URLs
https://www.psychologicalscience.org/publications/journals/pspi
Frequently Asked Questions (FAQs)
1. What is the Dunning–Kruger Effect?
It is a cognitive bias where people with low ability overestimate their competence, while highly skilled individuals may underestimate theirs.
2. Why do people overestimate their abilities?
Because they lack the knowledge needed to recognize their own limitations or mistakes.
3. How does this affect workplace performance?
It can lead to poor decision-making, resistance to feedback, and overconfidence in skills.
4. Can training help reduce this bias?
Yes, continuous learning and feedback improve self-awareness and competence.
5. Why do experts sometimes undervalue themselves?
They often assume others have similar knowledge, leading them to underestimate their own expertise.