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Session 4. Prior Knowledge & Misconceptions
Objective. By the end of this session, you will be able to distinguish a misconception from a knowledge gap in student responses, and diagnose which one you're looking at.
Every teacher has heard a confident wrong answer and wondered how a student could believe it after the topic was explained clearly. Often the student is not missing information; they are holding a different idea that makes sense to them. If you treat that as a gap and repeat the explanation, it usually returns unchanged next week. Learning to see the reasoning behind the answer changes what you do next.
Key ideas
Why Prior Knowledge Matters
- New learning attaches to existing schema — it doesn't land on a blank slate
- A knowledge gap: the student has no relevant prior structure to attach the new idea to yet
- A misconception: the student has a prior structure, but it's incorrect or incomplete
- The two look similar on the surface but call for very different responses
How Misconceptions Form — and How to Find Them
- Often built from overgeneralizing a rule that worked in a simpler case
- Sometimes an everyday intuition conflicts with the formal, correct model
- Diagnostic move: ask "why" or "how do you know," not just "what's the answer"
- Predict-observe-explain and targeted concept-check questions surface the reasoning, not just the result
Working with a misconception
Why correct explanations bounce off
A misconception is not random error. It is a working theory built from experience, and the student has used it successfully many times. When you explain the right idea, the student often fits your words into the old theory, so they can repeat your sentence and still believe the old thing. This is why a student may recite a definition correctly and then fail a question that asks for a prediction.
Change usually needs three things: the old idea is brought into the open, it meets a case it cannot explain, and the correct idea is then built and practised until it is more useful than the old one. Your job is to arrange that meeting, calmly, without making the student feel foolish.
Questions that reveal thinking
The quickest tool is a well-made diagnostic question. In a good multiple-choice item each wrong option matches a known misconception, so the choice tells you which idea the student holds, not only that they are wrong. Add a follow-up such as "how sure are you?" or "why did you choose this?" to separate a guess from a firmly held belief.
A study of middle school physical science published in American Educator found that teachers who knew the common wrong answers in their topic, and not only the right one, saw greater learning gains. You can build this knowledge by keeping a short list of the errors you meet each year, and by asking colleagues who teach the same grade what they see.
Examples from the classroom
Grade 5 natural science, Samarkand
Scene. Dilnoza asks her class: in summer it is hot because the Earth is closer to the Sun - true or false? Twenty of 32 students vote true and several say "everyone knows this". She does not correct at once. She asks them to think about why it would be winter in Australia at the same time. The class goes quiet, then starts arguing, and she introduces the tilted axis with a ball and a lamp.
Insight. Eliciting the idea and confronting it with a case it cannot explain works better than simply stating the correct answer.
Grade 6 mathematics, Uzbek-medium class
Scene. Aziz notices that many students write 0.35 > 0.7 because 35 is bigger than 7. These students are not missing numbers; they carry a whole-number rule into decimals. He gives a card with five decimals to place on a number line from 0 to 1, in pairs. Students see 0.7 lies further right, then explain why 0.70 and 0.7 are equal.
Insight. A rule that worked for whole numbers was overgeneralised; a task that shows the conflict is more effective than repeating the decimal rule.
Grade 8 geography, Russian-medium class
Scene. Malika is teaching the Aral Sea. When she asks why it shrank, several students answer that it dried up because of the hot climate. Others have no answer at all. She separates the two groups: for the first she uses maps and the story of river water diverted to cotton irrigation; for the second she first teaches what the Amu Darya and Syr Darya are.
Insight. Same wrong-looking silence, two different needs: a misconception needs confronting, a gap needs new information.
Common pitfalls
- Repeating the same explanation louder or slower when the student already holds a competing idea.
- Calling an answer "wrong" without finding out what reasoning produced it.
- Using only questions with one-word answers, which hide the thinking behind them.
- Embarrassing the student in front of the class, so others stop sharing their real ideas.
Diagnose: Misconception or Gap?
Your facilitator will guide you through this activity in the session.
Reflect
- Which sample answer was easiest to misdiagnose at first glance?
- How does your response differ once you know it's a misconception rather than a gap?
- What's a misconception you've seen repeatedly in your own subject or grade level?
Try it tomorrow
- Ask one "predict and explain" question at the start of a lesson and write down the different reasons you hear, not just the answers.
- Prepare one multiple-choice question where each wrong option matches a common error from your subject.
- After the correction, return to the same idea with a new question two or three days later to see whether it held.
Further reading and links
A gap needs new information. A misconception needs to be surfaced and directly confronted — simply repeating the correct explanation rarely dislodges it.