When does doing something wrong actually make things better?

When does doing something wrong actually make things better? Scientific American reports that new research supports the idea that challenging tests, and pretesting (taking tests without studying) can help students better learn new material.

They explain:

For years many educators have championed “errorless learning,” advising teachers (and students) to create study conditions that do not permit errors. For example, a classroom teacher might drill students repeatedly on the same multiplication problem, with very little delay between the first and second presentations of the problem, ensuring that the student gets the answer correct each time.

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