Unverified50% confidenceOpinionExact time
The author admits there is currently no rigorous evaluation method to prove the effectiveness of the feedback, judging only by whether mastery rises after the "I don't know" lesson plus a subsequent retry.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/18/2026
First Seen
Valid until: 1/16/2027
Sources
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