What is the Dunning-Kruger effect?
The Dunning–Kruger effect is a cognitive bias in which people with low ability at a task overestimate their ability. It is related to the cognitive bias of illusory superiority and comes from the inability of people to recognize their lack of ability. In the field of psychology, he Dunning-Kruger effect describes people who perform a certain task poorly while simultaneously overestimating their ability and knowledge in the relevant area.
The psychological phenomenon of illusory superiority was identified as a form of cognitive bias in Kruger and Dunning’s 1999 study, “Unskilled and Unaware of It: How Difficulties in Recognizing One’s Own Incompetence Lead to Inflated Self-Assessments”. The identification derived from the cognitive bias evident in the criminal case of McArthur Wheeler, who, on April 19, 1995, robbed two banks while his face was covered with lemon juice, which he believed would make it invisible to the surveillance cameras. This belief was based on his misunderstanding of the chemical properties of lemon juice as an invisible ink.
Where the Dunning-Kruger effect is seen
Think back to primary school. We all knew someone who thought they were more intelligent than they really were. Let’s call this person ‘John.’ Even though John is normally well below the class average in school assessments, he also raises his hand to speak far more than average in the classroom. John has unshakable confidence in his knowledge of history, science, and literature, insisting to his friends that his poor marks are simply a reflection of bad testing methods and his “not caring.” Still, it is abundantly clear to the teacher and his fellow classmates that John has no idea what he’s talking about. John consistently decides to raise his hand to speak on matters he is unfamiliar with. John’s inability to recognize his incompetence, and the resulting overconfidence, is what is known as the Dunning-Kruger effect.
How the Dunning-Kruger effect causes us to make bad decisions individually
The Dunning-Kruger effect can lead us to make poor decisions in our personal and professional lives. It is no mystery that competence in a certain area improves decision-making in that sphere. As our understanding of a topic, or experience with a task, increases, we become better at identifying good decisions from bad ones in those areas. Past success causes us to become confident in our ability because we foresee a high probability of future success. This is not usually a problem because our actual and perceived ability are relatively equal, which makes our probability calculations fairly sound.
However, when we think that we are better at something than we really are, a gap emerges between perceived and actual ability. This gap — or, over-evaluation of our actual ability — is problematic because it makes us believe there is a greater chance that our decisions will be good ones than is truly the case. This can explain why show contestants choose to subject themselves to what usually turns out to be public humiliation. They are unaware of their inability to sing, which causes them to be confident in their ability to sing — until they are rejected by the judges.
People who are affected by the Dunning-Kruger effect are also less able to learn from their mistakes. Their self-confidence makes them biased self-evaluators, and so they have difficulty identifying their bad decisions, as just that: bad. This is an issue, as we learn to make better decisions by looking back at the mistakes and successes of our previous ones.
How those decisions add up to systemic challenges
Decisions that are motivated by the Dunning-Kruger effect can multiply to create systemic problems. The primary challenge is that it may prevent expertise from reaching the decision-making table. In other words, it can prevent people who truly are proficient in a task or topic, from making the decisions in the relevant area of expertise.
Often the loudest person in the room gets the most attention and takes over the discussion. With regard to the previous example, John’s tendency to express uninformed views likely prevents other students with more fruitful points from participating. This phenomenon may also affect larger organizations, in which the most capable people do not always make the decisions; instead, those with the greatest perceived ability take precedence. The latter takes the place of the former, which, clearly, is sub-optimal.
Why does the Dunning-Kruger effect happen?
As said earlier, the Dunning-Kruger effect arises from a gap between perceived and actual competence. But why does this gap emerge?
The two-pronged problem
When we lack expertise and skill in an area, we often perform poorly as a result. The second part of the problem is that the deficiencies that lead to poor performance also make us unable to recognize it. How can you know that you are bad at something if you don’t have the tools to recognize your incompetence? Imagine trying to pick out a well-written book if you yourself do not have good grammar.
It is therefore the same skills and knowledge that are necessary to be good at something a person needs to realize they are not good at it. This means that if a person does not have those abilities, they are not only inept but unaware of their own inability. Dunning and Kruger call this the “dual burden.” As a result of the dual burden, many of us are unable to accurately assess our own abilities in some areas.
We can’t look at ourselves from the outside
Many people struggle with “metacognition”, which describes someone’s awareness of their own thinking and behaviour. For our purposes, it is our ability (or lack thereof) to step back and consider ourselves from an outside perspective. Doing this is often difficult, as most of us are accustomed to seeing the world, and ourselves, through our own eyes. Yet, from this ‘subjective’ point of view, we often consider ourselves to be highly skilled and knowledgeable. As a result, we often have difficulties recognizing a more realistic view of our own abilities. This makes sense: when we are grumpy or inconsiderate, it often takes a friend or family member to call us out. A lot of the time, we lack the self-awareness to notice about ourselves what we so easily notice about others.
This lack of ‘metacognition’ might also be related to our brain’s use of ‘heuristics.’ These are mental shortcuts we use to make decisions efficiently. Thinking about and questioning yourself takes time and energy. So, assumptions about our competence in certain situations could be a shortcut to solving them quickly.
We like to feel good about ourselves
Another reason why we sometimes experience the Dunning-Kruger effect is that it protects our self-esteem. No one likes feeling bad about themselves — and realizing that we are bad at something can have this effect because it may suggest that we lack intelligence. As a result, we often don’t want to plead ignorance to others or ourselves.
This response can be conscious or subconscious. It has been suggested that our mind creates a natural defense to respond in this way to these situations that we can be unaware of. This may be why we tend to overestimate our abilities and knowledge on various topics.
Why should someone be aware of the Dunning-Kruger effect?
That being said, we should be aware of the Dunning-Kruger effect because of the negative influence it can have over our decision-making. When someone doesn’t have the tools (ie. experience or cognitive capacity) to make an informed decision, they often don’t make it because of the high likelihood that it will have adverse consequences. But if someone is unaware of their shortcomings, they make such decisions irrespective of the negative implications they will likely have. Moreover, because people subjected to the Dunning-Kruger effect are confident in their abilities, significant resources and energy can be invested in the success they believe that poorly informed decision will bring. This is less than ideal at best and dangerous at worst.
Consider the scenario in which a young driver is so confident in their driving abilities that they decide to go on the highway in the midst of a dangerous snowstorm. Or, in a professional setting, think of an executive who boldly invests in the promotion of a product which they don’t understand.
It is also worth noting that overconfidence usually does not bode well with others– especially if it is misplaced. ‘Arrogant’ is a label worth avoiding.
How to avoid the Dunning-Kruger effect
Dunning and Kruger suggest that the overestimation of our competence is greatest when we have a narrow understanding of a topic. Our confidence finds its lowest point when we have no understanding, but trails down from its mistaken peak when we gain a fuller understanding that reveals the gaps in our knowledge. Here, we display a lower, but more realistic level of confidence in our abilities. As we gain expertise, we also gain confidence — but now it is well placed. Indeed, experts should display a high degree of confidence in their ability because they usually truly are capable. This chart demonstrates the U-shaped relationship between confidence and competence that characterizes the Dunning-Kruger effect.
But what does this have to do with avoiding the potentially damaging implications of the Dunning-Kruger effect?
Well, if our perceived ability of a subject is brought inline with our actual ability through increased knowledge, then one strategy would seem to be deepening our understanding. Rather than assuming you know all there is to know about a topic, explore it further. As you have a better grasp on a subject, you will probably realize there is still much to learn. This can help counteract our habit of mistakenly thinking we’re experts when we aren’t.
Another strategy is to ask other people to evaluate your performance. Remember, we often struggle to consider ourselves from an outside perspective that is more true to reality. This results in inflated self assessments. Asking others for advice or for constructive criticism can help us form a more honest picture of our own abilities.
How it all started
The psychological phenomenon of poor performers overestimating their abilities has been noted by writers and philosophers through the ages. Charles Darwin wrote: “Ignorance more frequently begets confidence than does knowledge.”
However, it was first explored scientifically by social psychologists David Dunning and Justin Kruger in 1999 — hence the name. Dunning and Kruger discovered the bias by testing students in the areas of humor, grammar, and logic. Each student’s test results were compared with the student’s estimate of how well they scored. Dunning and Kruger found that students with the lowest scores also had the greatest overestimations, while those who performed well underestimated their performance accordingly.
Example 1 – Poor debaters overvalue performance
In a more recent 2008 study conducted by Dunning and Kruger, as well as several other researchers, 58 pairs of college students participating in a debate tournament were examined.
After each round of debate, the students were asked to fill out a questionnaire on how well they thought they had performed. By comparing this data with their actual performance, Dunning and Kruger found that most students had overestimated their performance. On average, students thought they won 75.4% of their matches when they actually only won 46.7% of them.
The interesting part is that students performing in the lowest 25% in the tournament greatly overestimated their ability to debate. These students thought they had won nearly 59% of their matches, when in reality they won only 22% of them. Top performers (those in the top 25%), on the other hand, did not overestimate their performances nearly as much, estimating that they had won 95% when they actually won only 77%.
These results not only show a tendency for poor performers to overestimate their abilities but that actual and perceived ability are brought closer inline with better performance.
Example 2 – Startups nearly all fail
‘Startups’ have a spectacularly low rate of success. Nearly 98% fail in the first year.8 A CB Insights analysis of over 100 failed startups showed that 42% of startup products did not meet a market demand, 29% ran out of money, 23% had the wrong team.
Why do startups have such a high rate of failure? And given the low probability of success, why do many entrepreneurs still try to establish startups? The Dunning-Kruger effect most likely has a role to play.
Many of such entrepreneurs are either new to creating a startup, or new to the market their product looks to target. It may be that their confidence is largely driven by a perception of starting a business and of their product that is not inline with reality. Once the startup is launched and problems start to arise, confidence is lost.
As the entrepreneur becomes more experienced, the knowledge gaps that inspired enough confidence to embark on such a difficult endeavour disappear. This may be why we often hear small business owners say “it’s not as easy as it looks.”
What the Dunning-Kruger effect is
The Dunning-Kruger effect is the habit of people who perform poorly at a task or area also overestimating their ability and knowledge.
Why the Dunning-Kruger effect happens
In what’s known as the “dual burden,” the same skills and knowledge that are necessary to be good at something a person needs to realize they are not good at it. This means that if a person does not have those abilities, they are not only inept but unaware of their own inability. Relatedly, we often struggle with “metacognition,” which is to step back and consider yourself from an outside perspective. The opposing ‘subjective’ point of view we often take tends to result in a more generous perception of our abilities. Lastly, the Dunning-Kruger effect can protect our self-esteem. No one likes feeling bad about themselves — and realizing that we are bad at something can have this effect because it may suggest that we lack intelligence. As a result, we often don’t want to plead ignorance to others or ourselves.
Example #1 – Poor debaters overvalue performance
A 2008 study conducted by Dunning and Kruger, as well as several other researchers, looked at the expected versus actual performance of college students competing in a debate tournament. They found that while the average student tended to overestimate their performance, those who performed in the lowest 25% in the tournament disproportionately overestimated their ability to debate, while those performing in the highest 25% did not overestimate nearly as much. These results not only show a tendency for poor performers to overestimate their abilities, but that actual and perceived ability are brought closer inline with better performance.
Example #2 – Startups nearly all fail
‘Startups’ have a spectacularly low rate of success, with nearly 98% failing in the first year. Given this low probability of success, entrepreneurs are likely influenced by the Dunning-Kruger effect. Many of such entrepreneurs are either new to creating a startup or new to the market their product looks to target. Their confidence may be driven by a perception of starting a business and of their product that is not in line with reality. Once the startup is launched and problems start to arise, confidence is lost. As the entrepreneur becomes more experienced, the knowledge gaps that inspired enough confidence to embark on such a difficult endeavour disappears.
How to avoid the Dunning-Kruger effect
If our confidence is brought in line with our competence as our competence increases, then deepening our understanding of a topic may reduce the Dunning-Kruger effect in this area.
So, rather than assuming you know all there is to know about a topic, explore it further. As you have a better grasp of a subject, you will probably realize there is still much to learn. Another strategy is to ask other people to evaluate your performance. Remember, we often struggle to consider ourselves from an outside perspective that is more true to reality. Asking others for advice or for constructive criticism can help us form a more honest picture of our own abilities.
people tend to underestimate how long it will take them to carry out their plans. The “Dunning Krugger effect” may make us too confident in our ability to do so. Lastly, we might not think of the obstacles preventing us from sticking to our plans. The author ends by suggesting that we use ‘If-Then’ plans. These are plans where you state that ‘if’ something happens, ‘then’ you will carry out a certain behavior.