How good do you think you are at what you do? - Because it matters more than you think it does.
The Dunning-Kruger finding itself is fine. The actual problem is rule one of the Dunning-Kruger club, which is that you never know whether you are inside it.
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The classic Dunning-Kruger finding: People who perform worst on a task are supremely overconfident in their ability to perform that task.
But that's not the problem.
The first rule of the Dunning-Kruger club is that you don’t know you’re a member of the Dunning-Kruger club.