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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. ... 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.
Quoted from http://celandine13.livejournal.com/33599.html
Do read the whole thing! Interesting and thoughtful essay from 2012 on learning. Inspired by Mel Baggs essays.