I wasn’t an exceptional pianist, and when I’d play my nocturne for [my teacher], there would be a few clinkers. I apologized—I was embarrassed to be wasting his time. But he never seem to judge me for my mistakes. Instead, he’d try to fix them with me: repeating a three-note phrase, differently each time, trying to get me to unlearn a hand position or habitual movement pattern that was systematically sending my fingers to wrong notes.
I had never thought about wrong notes that way. I had thought that wrong notes came from being “bad at piano” or “not practicing hard enough,” and if you practiced harder the clinkers would go away. But that’s a myth.
In fact, wrong notes always have a cause. An immediate physical cause. Just before you play a wrong note, your fingers were in a position that made that wrong note inevitable. Fixing wrong notes isn’t about “practicing harder” but about trying to unkink those systematically error-causing fingerings and hand motions. That’s where the “telekinesis” comes in: pretending you can move your fingers with your mind is a kind of mindfulness meditation that can make it easier to unlearn the calcified patterns of movement that cause mistakes.
Remembering that experience, I realized that we really tend to think about mistakes wrong, in the context of music performance but also in the context of academic performance.
A common mental model for performance is what I’ll call the “error model.” In the error model, a person’s performance of a musical piece (or performance on a test) is a perfect performance plus some random error. You can literally think of each note, or each answer, as x + c*epsilon_i, where x is the correct note/answer, and epsilon_i is a random variable, iid Gaussian or something. Better performers have a lower error rate c. Improvement is a matter of lowering your error rate. This, or something like it, is the model that underlies school grades and test scores. Your grade is based on the percent you get correct. Your performance is defined by a single continuous parameter, your accuracy.
But we could also consider the “bug model” of errors. A person taking a test or playing a piece of music is executing a program, a deterministic procedure. If your program has a bug, then you’ll get a whole class of problems wrong, consistently. Bugs, unlike error rates, can’t be quantified along a single axis as less or more severe. A bug gets everything that it affects wrong. And fixing bugs doesn’t improve your performance in a continuous fashion; you can fix a “little” bug and immediately go from getting everything wrong to everything right. You can’t really describe the accuracy of a buggy program by the percent of questions it gets right; if you ask it to do something different, it could suddenly go from 99% right to 0% right. You can only define its behavior by isolating what the bug does.
Often, I think mistakes are more like bugs than errors. My clinkers weren’t random; they were in specific places, because I had sub-optimal fingerings in those places. A kid who gets arithmetic questions wrong usually isn’t getting them wrong at random; there’s something missing in their understanding, like not getting the difference between multiplication and addition. Working generically “harder” doesn’t fix bugs (though fixing bugs does require work).
Once you start to think of mistakes as deterministic rather than random, as caused by “bugs” (incorrect understanding or incorrect procedures) rather than random inaccuracy, a curious thing happens.
You stop thinking of people as “stupid.”
Tags like “stupid,” “bad at ____”, “sloppy,” and so on, are ways of saying “You’re performing badly and I don’t know why.” Once you move it to “you’re performing badly because you have the wrong fingerings,” or “you’re performing badly because you don’t understand what a limit is,” it’s no longer a vague personal failing but a causal necessity. Anyone who never understood limits will flunk calculus. It’s not you, it’s the bug.
This also applies to “lazy.” Lazy just means “you’re not meeting your obligations and I don’t know why.” If it turns out that you’ve been missing appointments because you don’t keep a calendar, then you’re not intrinsically “lazy,” you were just executing the wrong procedure. And suddenly you stop wanting to call the person “lazy” when it makes more sense to say they need organizational tools.
”Lazy” and “stupid” and “bad at ____” are terms about the map, not the territory. Once you understand what causes mistakes, those terms are far less informative than actually describing what’s happening. [...]
As a matter of self-improvement, I think it can make sense not to think in terms of “getting better” (“better at piano”, “better at math,” “better at organizing my time”). How are you going to get better until you figure out what’s wrong with what you’re already doing? It’s really more an exploratory process—where is the bug, and what can be done to dislodge it?
Sarah Constantin’s Errors vs. Bugs and the End of Stupidity remains one of my favorite essays.