Expertise increases self-knowledge, which includes awareness of one’s limitations. Conversely, the less you know, the less aware you are of your limitations and the more overconfident you will be.

But while knowledge can sometimes be a blessing, it can also be a curse. Because once people know a lot about something, it can be difficult for them to remember what it’s like not to know that much. To imagine what it’s like not having that depth of understanding.

As Chip and Nancy put it, for people afflicted with component focus, “wholes are not the ‘sum of their parts,’ they are a function of one part.” The deeper a person’s expertise, the worse this narrow focus gets. Chip and Nancy show how “the curse of knowledge” accentuates the coordination troubles caused by component focus: Experts wrongly assume that—because a subject comes so easily to them after learning about it for years—what they know is obvious and can quickly be grasped by others. Experts unwittingly create coordination snafus by failing to pass along essential information to people in other positions and fields because they assume it is self-evident. Or, when they try to pass information along, experts provide explanations they believe are easy to understand but are incomprehensible to people who aren’t indoctrinated into their circle.

More generally, when you find yourself thinking, “I can do this in my sleep,” watch out! Overconfidence is a precursor to complex failure, just as it is to basic failure.

Eskreis-Winkler and Fishbach concluded that unawareness of failures’ useful information made learning from failure difficult. So they designed an experiment in which participants were helped to identify the useful information in their failures, and this made them more likely to share them.