One of the oldest failure modes in learning is confusing recognition for knowledge. You recognize the diagram when you see it. You nod along to the lecture. You feel familiar with the concept. You cannot, however, produce it.
The gap between recognition and production is invisible to the student. It is not invisible to Explain-back.
Explain-back asks the student to teach a concept back in their own words. Haiku grades the explanation on a 0–5 rubric — 0 for off-topic or empty, 5 for precise and self-consistent enough to teach a peer. Feedback is one sentence, actionable.
Scores below 3 requeue the concept into the recall queue. Not as punishment, but as data. The student's own explanation is now the diagnostic. What they can't produce, they don't know.
Users describe Explain-back as 'the thing that stopped me from lying to myself.' That is exactly the intended effect.
Written by Brainback Research. Published Mar 24, 2026. Filed under Method.