Three degrees of explanation

At a maths-ed workshop I attended recently, one of the other participants (unfortunately I don’t recall who) quoted a piece of advice which neatly sums up the educational benefits of self-explanation, peer instruction, and what I’m just going to call my day job:

If you really want to understand something, there are three steps.

  1. Explain it to yourself.
  2. Explain it to a friend.
  3. Explain it to an enemy.

If anyone knows who should be given the credit for this, please let me know…

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