PSLE Learner’s Guide · Volume 0979
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An object is seen in the colour of light that is both present in the illumination and reflected by the object into the eye.
Series routes: Use the complete PSLE Learner’s Guide volume directory, the original PSLE Learning Guide and the Science learning hub.
This guide uses original Primary 6 practice and does not predict a live question. Consult the SEAB PSLE formats examined in 2026 page for official information.
Open the full chapter index
- 1. Trace the full path
- 2. Treat white light as a mixture
- 3. Find the overlap
- 4. Predict a dark appearance
- 5. Do not say colour is manufactured
- 6. Keep reflection and filtering separate
- 7. Use careful language for real materials
- 8. Control examination diagrams
- 9. Worked examples
- 10. Independent practice
- 11. Delayed transfer
- 12. Family guidance and FAQs
CHAPTER 1 OF 12 · Back to contents
1. Trace the full path
Light must travel from a source to the object and then from the object to the eye. Apparent colour depends on the light that completes this path.
Build the explanation by naming the colours present in the incident illumination and the wavelengths or colour components the object reflects rather than absorbs. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking the overlap that can travel from object to eye and returning to white coloured and absent light dark appearance filters observer path and evidence limits. State why the tempting alternative is too strong, incomplete or about a different stage.
- Check the colours present in the incident illumination.
- Check the wavelengths or colour components the object reflects rather than absorbs.
- Check the overlap that can travel from object to eye.
- Check white coloured and absent light dark appearance filters observer path and evidence limits.
CHAPTER 2 OF 12 · Back to contents
2. Treat white light as a mixture
White light contains a range of visible colours. Under white illumination, a red object appears red because it reflects red light more strongly and absorbs much of the other incident light.
Build the explanation by naming the colours present in the incident illumination and the wavelengths or colour components the object reflects rather than absorbs. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking the overlap that can travel from object to eye and returning to white coloured and absent light dark appearance filters observer path and evidence limits. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 3 OF 12 · Back to contents
3. Find the overlap
Compare colours available from the source with colours the object can reflect. Only their overlap can reach the eye from that object.
Build the explanation by naming the colours present in the incident illumination and the wavelengths or colour components the object reflects rather than absorbs. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking the overlap that can travel from object to eye and returning to white coloured and absent light dark appearance filters observer path and evidence limits. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 4 OF 12 · Back to contents
4. Predict a dark appearance
A red object under blue-only illumination may appear dark because red light is absent and much of the incident blue is absorbed rather than reflected to the eye.
Build the explanation by naming the colours present in the incident illumination and the wavelengths or colour components the object reflects rather than absorbs. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking the overlap that can travel from object to eye and returning to white coloured and absent light dark appearance filters observer path and evidence limits. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 5 OF 12 · Back to contents
5. Do not say colour is manufactured
The object does not create the usual reflected colour merely because it has a colour label. The relevant component must be present in the incident light.
Build the explanation by naming the colours present in the incident illumination and the wavelengths or colour components the object reflects rather than absorbs. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking the overlap that can travel from object to eye and returning to white coloured and absent light dark appearance filters observer path and evidence limits. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 6 OF 12 · Back to contents
6. Keep reflection and filtering separate
A coloured filter controls which light reaches an object or eye; the object then reflects or absorbs the light incident on it. These are connected stages with different owners.
Build the explanation by naming the colours present in the incident illumination and the wavelengths or colour components the object reflects rather than absorbs. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking the overlap that can travel from object to eye and returning to white coloured and absent light dark appearance filters observer path and evidence limits. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 7 OF 12 · Back to contents
7. Use careful language for real materials
School models describe dominant reflection. Real pigments and sources may reflect or emit broader ranges, so predictions should follow the stated idealised colours and observed evidence.
Build the explanation by naming the colours present in the incident illumination and the wavelengths or colour components the object reflects rather than absorbs. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking the overlap that can travel from object to eye and returning to white coloured and absent light dark appearance filters observer path and evidence limits. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 8 OF 12 · Back to contents
8. Control examination diagrams
Label source colour, arrow to object, absorbed components, reflected component and arrow to eye. If no relevant component is reflected, state dark rather than inventing black light.
Build the explanation by naming the colours present in the incident illumination and the wavelengths or colour components the object reflects rather than absorbs. A remembered keyword is not enough: connect the observation to the mechanism and identify what would have to change for the conclusion to change.
Repair the nearest misconception by checking the overlap that can travel from object to eye and returning to white coloured and absent light dark appearance filters observer path and evidence limits. State why the tempting alternative is too strong, incomplete or about a different stage.
CHAPTER 9 OF 12 · Back to contents
9. Worked examples
Worked case 1: Why does a red card look red in white light?
Controlled answer. It reflects red light from the incident white light into the eye. White illumination supplies red among other colours.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Trace source, card and eye. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “It reflects red light from the incident white light into the eye” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck the colours present in the incident illumination, the wavelengths or colour components the object reflects rather than absorbs, the overlap that can travel from object to eye, white coloured and absent light dark appearance filters observer path and evidence limits. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 2: A red card is lit only by blue light. Likely appearance?
Controlled answer. Dark. The source supplies no red component and the card absorbs much of the blue.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. State the idealised-model assumption. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Dark” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck the colours present in the incident illumination, the wavelengths or colour components the object reflects rather than absorbs, the overlap that can travel from object to eye, white coloured and absent light dark appearance filters observer path and evidence limits. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 3: A blue card under blue light?
Controlled answer. Blue. Blue is present and the card reflects it to the eye.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Compare under red-only light. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Blue” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck the colours present in the incident illumination, the wavelengths or colour components the object reflects rather than absorbs, the overlap that can travel from object to eye, white coloured and absent light dark appearance filters observer path and evidence limits. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 4: A white object under green light?
Controlled answer. Green. A white object reflects the available visible light, which here is green.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Change the source to red. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Green” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck the colours present in the incident illumination, the wavelengths or colour components the object reflects rather than absorbs, the overlap that can travel from object to eye, white coloured and absent light dark appearance filters observer path and evidence limits. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 5: A black object under white light?
Controlled answer. Black or very dark. It absorbs most incident visible light and reflects little to the eye.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Avoid saying it reflects black light. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Black or very dark” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck the colours present in the incident illumination, the wavelengths or colour components the object reflects rather than absorbs, the overlap that can travel from object to eye, white coloured and absent light dark appearance filters observer path and evidence limits. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 6: Repair: a red object always sends out red light.
Controlled answer. It appears red when red incident light is available and reflected to the eye. Ordinary objects reflect rather than generate the relevant illumination.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Name a luminous exception separately. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “It appears red when red incident light is available and reflected to the eye” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck the colours present in the incident illumination, the wavelengths or colour components the object reflects rather than absorbs, the overlap that can travel from object to eye, white coloured and absent light dark appearance filters observer path and evidence limits. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 7: What two sets must overlap?
Controlled answer. Colours present in incident light and colours the object can reflect. Their intersection determines reflected light reaching the eye.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Represent the sets in words. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Colours present in incident light and colours the object can reflect” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck the colours present in the incident illumination, the wavelengths or colour components the object reflects rather than absorbs, the overlap that can travel from object to eye, white coloured and absent light dark appearance filters observer path and evidence limits. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 8: Yellow object under red light in an ideal primary-colour model?
Controlled answer. It may appear red if the material reflects the red component. The available red can be reflected while green is absent.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Use the exact model stated by the question. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “It may appear red if the material reflects the red component” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck the colours present in the incident illumination, the wavelengths or colour components the object reflects rather than absorbs, the overlap that can travel from object to eye, white coloured and absent light dark appearance filters observer path and evidence limits. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 9: Why is a colour label insufficient?
Controlled answer. Illumination may not contain that colour component. Apparent colour depends on source and surface together.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Add observer path. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Illumination may not contain that colour component” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck the colours present in the incident illumination, the wavelengths or colour components the object reflects rather than absorbs, the overlap that can travel from object to eye, white coloured and absent light dark appearance filters observer path and evidence limits. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 10: What makes an object visible?
Controlled answer. Light from it must enter the eye. For a non-luminous object, that light is usually reflected incident light.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Block the path and predict. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Light from it must enter the eye” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck the colours present in the incident illumination, the wavelengths or colour components the object reflects rather than absorbs, the overlap that can travel from object to eye, white coloured and absent light dark appearance filters observer path and evidence limits. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 11: A filter before the object transmits only blue. What reaches a red card?
Controlled answer. Blue light. The filter controls illumination before the surface interaction.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Predict the reflected result. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Blue light” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck the colours present in the incident illumination, the wavelengths or colour components the object reflects rather than absorbs, the overlap that can travel from object to eye, white coloured and absent light dark appearance filters observer path and evidence limits. Decide whether the evidence proves the conclusion or only supports a limited statement.
Worked case 12: A filter after the object transmits no reflected red. What does the eye receive?
Controlled answer. Little or no red from that path. The later filter can remove the reflected component.
Mechanism. Identify the exact relationship, apply the relevant rule and preserve every stated condition. A surface clue may be compatible with several explanations, so the answer must show what makes this case decisive.
Misconception repair. Do not turn partial evidence into complete proof. Name the closest wrong answer, identify its missing condition and explain why the observed evidence supports the narrower conclusion.
Transfer. Keep the sequence labelled. Solve the altered case from the mechanism rather than copying the previous wording.
Reverse construction. Begin with the controlled answer “Little or no red from that path” and invent a fresh prompt that would justify it for the same reason. Then change one decisive condition to create a near-nonexample. This reverse task checks whether the learner owns the boundary rather than merely recognising the original sentence.
Explanation standard. A complete explanation names the observation, connects it to the rule and limits the conclusion to what follows. It should remain valid if decorative details are removed. If the explanation depends on the story topic instead of the decisive relation, rebuild it.
Audit. Recheck the colours present in the incident illumination, the wavelengths or colour components the object reflects rather than absorbs, the overlap that can travel from object to eye, white coloured and absent light dark appearance filters observer path and evidence limits. Decide whether the evidence proves the conclusion or only supports a limited statement.
CHAPTER 10 OF 12 · Back to contents
10. Independent practice
Practice 1: Does darkness mean black light is reflected?
Explained answer. No. Darkness means little visible light reaches the eye from the object.
Delayed transfer. Rewrite a faulty explanation. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 2: Can two objects of different materials look similar under one light?
Explained answer. Yes. Restricted illumination can hide differences in their usual reflection patterns.
Delayed transfer. Change to white light. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 3: Why mention the eye?
Explained answer. Colour is observed only when reflected light reaches a detector or eye. Source and surface alone do not complete the viewing path.
Delayed transfer. Draw a blocked-eye case. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 4: What does absorption do?
Explained answer. It removes incident components from the reflected path and transfers their energy to the material. Those components do not reach the eye as reflected light.
Delayed transfer. Do not confuse absorption with disappearance of energy. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 5: What is the safest model statement?
Explained answer. The observed colour is the light component both available and reflected to the eye. It identifies source, object and observer roles.
Delayed transfer. Use it on an unfamiliar colour pair. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 6: What evidence would test a prediction?
Explained answer. Hold the object and observer fixed while changing one known illumination colour. Only the source condition changes in the fair comparison.
Delayed transfer. Record apparent colour cautiously. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 7: What is the diagram audit?
Explained answer. Label incident colour, surface response, reflected colour, direction and eye. Every arrow must carry a stated component.
Delayed transfer. Remove impossible outgoing colours. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
Practice 8: State the full method.
Explained answer. List incident colours, list colours the object reflects, find their overlap, trace that reflected light to the eye and state dark if little visible light completes the path. The method predicts apparent colour without treating colour as a fixed glow.
Delayed transfer. Apply after a delayed filter-and-object chain. Cover the answer later and rebuild the chain.
Control question. Which exact condition does the nearest wrong answer miss? State it before checking.
Extension. Change one decisive feature while keeping the story similar. Explain why the conclusion now stays or changes.
Independent proof. Restate the answer without copying its wording. Your version must identify the evidence, the governing relationship and the boundary of the claim. Then write one fact that would be relevant but still insufficient on its own. This separates explanation from repetition.
Delayed comparison. Save this item beside the near-nonexample you created. On the next attempt, compare them before answering and point to the single feature that controls the difference. If more than one feature changed, revise the pair so the comparison stays fair.
CHAPTER 11 OF 12 · Back to contents
11. Delayed transfer
On day one, solve clear examples. On day three, mix examples, near-nonexamples and incomplete evidence. On day seven, solve without headings or a word bank. Delay reveals whether the method can be reconstructed independently.
Keep an error log for the first failed stage: reading, representation, rule, execution or checking. The earliest failure identifies the repair.
Interleave this skill with neighbouring ideas that share vocabulary. Classify each item only after naming the distinguishing condition.
In timed work, mark the relationship, apply the rule, write the conclusion and audit one condition. If checking changes the answer, record the overlooked feature.
Create a teach-back card with a near-nonexample on the front and the repaired mechanism on the back. Explain why the tempting answer fails.
Finish with one basic example, one boundary case and one transfer case. Supply explanations that a classmate can verify.
For a second delayed test, reverse the direction: start from a conclusion and invent evidence that would justify it, then evidence that would be insufficient. This exposes the boundary between relevance and proof.
CHAPTER 12 OF 12 · Back to contents
12. Family guidance and FAQs
Guidance for parents and tutors
Ask for the decisive condition before confirming the answer. Use prompts such as “What exactly happened?”, “Which stage or meaning is this?” and “What would prove it?”
Fade support from labelled examples to mixed questions and delayed open response. Independent retrieval after time and topic change is the target.
Praise precise claim control. Narrowing an answer when evidence is incomplete is scientific and academic strength.
Frequently asked questions
Should I memorise the rule?
Memorise the compact rule, then practise examples and near-nonexamples so the conditions remain visible.
What if two answers seem possible?
Return to the exact relationship and choose the option satisfying every stated condition without adding facts.
Why delay practice?
Immediate repetition may depend on the recent explanation; delay tests reconstruction.
How should an error be corrected?
Name the first failed stage and practise it with a changed example.
When is the skill ready?
When the learner can explain, apply and transfer it after a delay.
What is the final audit?
Check relationship, mechanism, claim strength and whole-question fit.
Next routes
Continue at the Science learning hub or return to the series directory.