Telling students they need to take advantage of the feedback they get isn’t just good advice — it’s established science. In the last few decades, researchers have discovered a lot about how people become experts. The main idea, made popular by everyone from author Malcolm Gladwell to rapper Macklemore, is the 10,000-hour rule. Ten thousand is the number of hours it takes to become an expert in almost any field. While it’s wonderful that people are starting to understand how work leads to expertise, the most important part of that research is not how much practice someone needs to perform, but what kind of practice. This latter category is called deliberate practice and involves isolating what’s not working and mastering the difficult area before moving on.

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