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Feedback is important in education. It is commonly believed that immediate feedback is very important. That is why instructors stay often late at night grading students’ assignments – to make sure that the students get their feedback as early as possible. However, surprisingly, experiments show that in many cases, delayed feedback is more efficient that the immediate one. In this paper, we provide a simple geometric explanation of this seemingly counter-intuitive empirical phenomenon. Mathematics Subject Classification: 51P99, 93B52, 97U99

In education, delayed feedback is often more efficient than immediate feedback: a geometric explanation