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AI Literacy · Stage 6

Models Drift

An AI learns from the world as it was at one moment — but the world keeps changing, so its answers slowly go out of date. That slow slide is called drift, and it is why every model must be checked and refreshed.

✦ AI Literacy📘 Stage 6 · S6⏱ ~10 min🧒 Ages 10–12★ Free to start
I can explain why models drift and need checking.
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Kavi the owl for AI Literacy
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Kavi and the Weather That Moved On

Kavi the owl trains a little machine to guess tomorrow's weather from last year's skies — and at first it is brilliant! But seasons turn, new winds blow, and slowly its guesses start going wrong. "It didn't break," hoots Kavi, puzzled, then grinning. "The world moved on and my machine stood still — that is drift. So I must keep checking it on fresh skies and teach it again!"

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What your child will learn

1Why a model goes out of dateAn AI learns one snapshot of the world from its training data. Whether it stays right depends on one thing: does the world stand still, or move on? Tap each side!
2Does it drift, or stay fixed?A model drifts only when the thing it learned keeps changing. If that thing never changes, the model stays right forever. Sort each one!
3The check-and-refresh cycleA good model is never truly 'finished.' Teams keep it accurate by looping through these steps as the world changes. Tap each stage!
4Will this model drift?Read what each model does, then decide: will it slowly drift, or stay accurate? Ask yourself — does the thing it learned keep changing? Pick, then tap to check. Tap Next test for more.
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A peek inside

A spam filter worked brilliantly last year. This year it lets lots of new spam through, even though nobody changed the filter. What happened?
A model learns its pattern from the examples it was trained on — a snapshot of the spam that existed back then. But spammers keep inventing brand-new tricks the filter never saw. The world (spam) moved on while the filter's pattern stood still, so it fits worse and worse. Its accuracy did not fail all at once; it quietly drifted.

Try this at home: What does it mean when a model 'drifts'?

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Questions parents ask

+What does it mean when an AI model 'drifts'?

A model learns its pattern from data gathered at one time — a snapshot of the world. As the world changes, that old pattern fits the new world worse and worse, so the model's answers quietly become less accurate. That slow slide out of date is called drift.

+Why do models drift over time?

Because the world keeps changing. New slang and words appear, prices rise, fashions change, spammers invent new tricks, and new kinds of photos and data show up. The model still uses the old pattern it learned, so it slowly stops matching reality.

+Why must a model be checked, and how?

Drift is usually silent — the model keeps answering confidently, so you cannot tell it is slipping without testing it. You check it by running fresh, recent, real examples through it and comparing its answers to what actually happened, then watching whether its accuracy is dropping.

+How do you fix a model that has drifted?

You retrain it with new, up-to-date data so it learns the world as it is now, and then you check it again. Because the world keeps changing, this is a repeating cycle, not a one-time job.

+Do all models drift?

No. A model about things that keep changing — trending songs, prices, slang — drifts and needs frequent checking. A model about fixed facts that never change, like 'a triangle has three sides' or 'a week has seven days', cannot drift.

+What age is this 'Models Drift' lesson for?

It is a Stage 6 lesson for roughly ages 11–12 in KAVI Academy's AI-literacy track — the top of primary, getting learners secondary-ready. It uses a story, sorting, comparing and predicting games, with light reading.

+Is the lesson free?

Yes — this overview and the printable PDF handout are free. The full interactive lesson and the endless practice are part of KAVI Academy.

Ready to play and learn?

Start the free interactive lesson, or print the handout for screen-free play.

Start the free lesson →⬇ Download PDF

Part of AI Literacy · Stage 6 · S6 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.