Series route: This guide belongs to the complete PSLE Learner’s Guide volume directory. The original PSLE Learning Guide supplies the wider English, Mathematics and Science route, while PSLE English, Mathematics and Science provide verified subject-specific continuation.
Find your route through this guide
This volume solves one precise learner problem: the learner hears or reads a correction, discards the entire earlier instruction, combines both conflicting values, applies the replacement too widely, or forgets conditions that remain in force. The aim is not to memorise a slogan. It is to understand the mechanism well enough to recognise the idea when the wording, numbers, diagram or context changes. A Primary 6 learner should be able to explain the decision, perform it under time pressure, and detect a tempting answer that only looks familiar.
- Understand the mechanism before memorising a form.
- Study the worked examples and compare near-misses.
- Repair common misconceptions with targeted tests.
- Complete graded independent practice before reading the answers.
- Use delayed transfer and examination control to make the skill durable.
- Use the parent and tutor notes only after the learner has attempted the work.
The problem beneath the mistake
Instructions often arrive in stages. A speaker may say Tuesday, then correct only the day to Thursday while leaving the time and place unchanged.
The word “sorry,” “rather,” “instead,” “correction” or “I mean” can signal that a later detail replaces an earlier one.
A correction is not automatically a total restart. Its grammatical target and surrounding words determine how much changes.
If a Mathematics question revises the length from 12 cm to 15 cm, calculations depending on length must be updated, but an unchanged width of 8 cm remains valid.
If a Science note corrects the heating time from four minutes to six minutes, the material, apparatus and measured variable stay the same unless the note changes them too.
If an English listening announcement changes Room 3 to Room 5, retaining both rooms produces an impossible combined answer. The earlier room must be replaced.
Some updates are additions rather than corrections. “Bring a pencil, and also a ruler” keeps both items. Signal words and compatibility decide whether to add or replace.
Some statements explicitly cancel everything: “Ignore the previous instructions; use the new procedure.” That wider scope must be obeyed because the source states it.
A field ledger is useful: date, time, place, quantity, condition, action. Update only the field named by the correction.
Downstream work must be repaired. Changing a value but leaving an old total, graph point or conclusion creates an internally inconsistent answer.
The latest statement is not always the winner when it discusses a different case. Before replacing, confirm that both statements refer to the same item, condition and time.
The safe routine is detect the correction signal, name its target, mark replace/add/cancel, preserve compatible details, rebuild the current instruction, then recompute every dependent result.
Core decision: A clear later correction normally replaces the earlier information only where the two conflict. Every earlier detail outside that correction remains active unless the source explicitly cancels, restarts or broadens the change. Build a current version by locating the correction target, replacing that field, preserving unchanged fields and checking downstream consequences.
A useful rule has three parts: a trigger, an operation and a check. The trigger tells you when the rule applies. The operation tells you what to do. The check tells you whether the result still matches the meaning of the question. Learners who remember only the operation often apply it in the wrong place; learners who remember only an example often freeze when the surface details change.
Mechanism: why the rule works
1. Detect the update signal
Correction words distinguish revision from ordinary continuation.
Diagnostic question: Does the later statement repair, add or cancel? Reliable response: Circle the signal word and label its job.
2. Name the target field
A correction usually attaches to one value, label, time, noun phrase or procedural step.
Diagnostic question: Exactly what words are being replaced? Reliable response: Box only the conflicting field.
3. Check reference identity
Replacement is valid only when both statements concern the same case.
Diagnostic question: Do item, trial, person and condition match? Reliable response: Do not overwrite a different case.
4. Preserve compatible details
Earlier information remains current where no conflict exists.
Diagnostic question: Which fields are untouched? Reliable response: Copy them into the rebuilt final version.
5. Rebuild one current record
Keeping an old and new conflicting value creates ambiguity.
Diagnostic question: What is the final usable instruction? Reliable response: Write a clean consolidated version.
6. Repair downstream consequences
Calculations, graph points and conclusions using the old detail may now be wrong.
Diagnostic question: Which later steps depend on the changed field? Reliable response: Recompute from the correction point onward.
Worked examples: make the decision visible
Do not race through these examples. Before reading each explanation, name the evidence that matters and the information that does not. Then compare the correct route with the tempting route. That comparison is where the transferable learning sits.
Worked example 1: Listening update
Task. “Meet at 2 pm in Room 3—sorry, Room 5.”
Reasoning. Only the room is corrected. The controlling idea is the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail. This prevents a learner from choosing an answer merely because one word, number or observation resembles a remembered example.
Answer. Meet at 2 pm in Room 5.
Independent check. Time remains because it does not conflict. A good check approaches the conclusion from a different direction. Repeating the same steps more slowly may repeat the same hidden assumption.
Worked example 2: Date and time
Task. “The event is Tuesday at 4 pm. It has moved to Thursday.”
Reasoning. Moved to Thursday targets the day, not the time. The controlling idea is the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail. This prevents a learner from choosing an answer merely because one word, number or observation resembles a remembered example.
Answer. The current record is Thursday at 4 pm, unless context says otherwise.
Independent check. Preserve the compatible time. A good check approaches the conclusion from a different direction. Repeating the same steps more slowly may repeat the same hidden assumption.
Worked example 3: Mathematics value
Task. A rectangle is 12 cm by 8 cm; a note corrects 12 cm to 15 cm.
Reasoning. Length changes while width stays 8 cm. The controlling idea is the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail. This prevents a learner from choosing an answer merely because one word, number or observation resembles a remembered example.
Answer. New area is 15×8=120 cm².
Independent check. Discard the old 96 cm² result. A good check approaches the conclusion from a different direction. Repeating the same steps more slowly may repeat the same hidden assumption.
Worked example 4: Science duration
Task. Heat sample A for four minutes; later instruction says six minutes instead.
Reasoning. Duration is replaced for the same sample and procedure. The controlling idea is the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail. This prevents a learner from choosing an answer merely because one word, number or observation resembles a remembered example.
Answer. Heat sample A for six minutes under the other stated conditions.
Independent check. Update any table heading or conclusion using duration. A good check approaches the conclusion from a different direction. Repeating the same steps more slowly may repeat the same hidden assumption.
Worked example 5: Addition
Task. “Bring a pencil. Also bring a ruler.”
Reasoning. Also adds a compatible item rather than replacing pencil. The controlling idea is the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail. This prevents a learner from choosing an answer merely because one word, number or observation resembles a remembered example.
Answer. Bring both pencil and ruler.
Independent check. Signal and compatibility support addition. A good check approaches the conclusion from a different direction. Repeating the same steps more slowly may repeat the same hidden assumption.
Worked example 6: Full cancellation
Task. “Ignore the earlier method and follow steps 1–4 below.”
Reasoning. The source explicitly broadens the cancellation. The controlling idea is the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail. This prevents a learner from choosing an answer merely because one word, number or observation resembles a remembered example.
Answer. Use only the new method.
Independent check. Do not preserve steps the source cancelled. A good check approaches the conclusion from a different direction. Repeating the same steps more slowly may repeat the same hidden assumption.
Worked example 7: Different case
Task. Trial A uses 20 mL. Trial B is later described as using 30 mL.
Reasoning. The later value concerns a different trial. The controlling idea is the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail. This prevents a learner from choosing an answer merely because one word, number or observation resembles a remembered example.
Answer. Keep both values attached to their trials.
Independent check. Later position alone does not trigger replacement. A good check approaches the conclusion from a different direction. Repeating the same steps more slowly may repeat the same hidden assumption.
Worked example 8: Dependent conclusion
Task. A corrected data point changes the calculated mean.
Reasoning. Replacing the cell without recalculating leaves stale work. The controlling idea is the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail. This prevents a learner from choosing an answer merely because one word, number or observation resembles a remembered example.
Answer. Recompute the mean and any comparison based on it.
Independent check. Trace dependencies forward. A good check approaches the conclusion from a different direction. Repeating the same steps more slowly may repeat the same hidden assumption.
Deepening lab: compare cases, conditions and limits
A method becomes independent when you can say where it applies, where it stops and which change would alter the conclusion. The cases below deliberately vary one structural feature at a time. For each case, pause before the analysis and predict whether the core rule remains available. Then name the exact condition that controls the decision. This is harder than repeating a worked solution, but it is also closer to what an unfamiliar examination item demands.
Deepening case 1: Room only
Case. Room changes; time and date do not.
Analysis. Replace location field only. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Write final record. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 2: Time only
Case. Start time changes.
Analysis. Keep venue and required materials. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Update schedule. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 3: Quantity only
Case. Number of items changes.
Analysis. Recalculate totals that depend on quantity. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Preserve unit price. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 4: Unit correction
Case. A value changes from cm to mm without changing numeral.
Analysis. Meaning changes despite same number. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Convert downstream work. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 5: Label correction
Case. Sample B is corrected to Sample C.
Analysis. Move the observation to the right label. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Do not duplicate it. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 6: Spelling correction
Case. A name is corrected.
Analysis. Replace the conflicting spelling everywhere relevant. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Keep the person’s other details. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 7: Added condition
Case. A later clause says “only if it rains.”
Analysis. This restricts the action rather than replacing its content. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Attach the condition. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 8: Removed condition
Case. The source explicitly says the earlier restriction no longer applies.
Analysis. Cancel only that restriction. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Keep other requirements. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 9: Procedure restart
Case. The source says start again with a new method.
Analysis. The cancellation scope is broad. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Do not mix procedures. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 10: Two corrections
Case. Day changes, then room changes.
Analysis. Apply both non-conflicting updates. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Build one final record. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 11: Correction of correction
Case. A final statement revises the same field again.
Analysis. Keep the latest clear value for that case. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Show version order. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 12: Ambiguous pronoun
Case. “Change it to 8” has two possible referents.
Analysis. Replacement target is unclear. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Seek grammatical or task evidence before overwriting. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 13: Table cell
Case. One cell is corrected.
Analysis. Other rows and columns remain unless dependent formulae change. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Recompute totals. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 14: Graph point
Case. One reading changes.
Analysis. Move the corresponding point and reconsider the trend. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Do not redraw unrelated points. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 15: Answer explanation
Case. Evidence value changes.
Analysis. The conclusion may need weaker or stronger wording. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Audit claim strength. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Deepening case 16: Complete audit
Case. Target, scope, unchanged fields and dependencies are recorded.
Analysis. The final version is coherent. Notice that the answer depends on the exact target of the correction, its scope, the earlier details that remain compatible, the current final version and every calculation or conclusion that depends on the changed detail; changing a decorative detail would not be enough to change the reasoning.
Challenge. Give the consolidated answer. State the conclusion in one precise sentence, then add one sentence that names the evidence or relationship that makes it valid.
Finish the lab with a blank-page recall. Write the rule, its conditions, one confirming example, one near-miss and one independent check from memory. Compare that page with the article only after finishing. If the rule is correct but the condition is missing, the learning is not yet safe: an overgeneralised rule can produce confident errors. If the condition is correct but no example can be generated, practise construction rather than rereading.
Common misconceptions and targeted repairs
Misconception 1: Discard everything
What the learner may think. Any correction cancels the entire earlier message.
Why it fails. Most corrections have local grammatical scope. The error feels efficient because it removes a decision, but it also removes the evidence boundary that makes the answer valid.
Targeted repair. Identify the target field. Use this short test immediately: What remains compatible?
Misconception 2: Keep both values
What the learner may think. Old and new details should both be written.
Why it fails. Conflicting values cannot both be current for the same field. The error feels efficient because it removes a decision, but it also removes the evidence boundary that makes the answer valid.
Targeted repair. Replace the old value. Use this short test immediately: Is the signal correction or addition?
Misconception 3: Latest always replaces
What the learner may think. Any later number overrides an earlier one.
Why it fails. It may describe a different case or variable. The error feels efficient because it removes a decision, but it also removes the evidence boundary that makes the answer valid.
Targeted repair. Match references first. Use this short test immediately: Are trial and condition identical?
Misconception 4: Update value only
What the learner may think. The corrected number is written but totals stay unchanged.
Why it fails. Dependent work still contains the old information. The error feels efficient because it removes a decision, but it also removes the evidence boundary that makes the answer valid.
Targeted repair. Trace consequences forward. Use this short test immediately: Which formula used the old value?
Misconception 5: Addition means replacement
What the learner may think. Also or in addition removes the first item.
Why it fails. Those signals normally preserve and add. The error feels efficient because it removes a decision, but it also removes the evidence boundary that makes the answer valid.
Targeted repair. Classify update type. Use this short test immediately: Can both details coexist?
Misconception 6: No signal means guess
What the learner may think. A learner chooses whichever detail seems convenient.
Why it fails. Scope must come from grammar, reference and compatibility. The error feels efficient because it removes a decision, but it also removes the evidence boundary that makes the answer valid.
Targeted repair. State uncertainty when genuinely unresolved. Use this short test immediately: What textual evidence identifies the target?
Graded independent practice
Attempt each item without looking ahead. Write one line that identifies the controlling evidence before writing the final answer. Items 1–3 check recognition, 4–7 require explanation, and the later items change the surface form so that memory alone is insufficient.
Practice 1: Local correction
Question. “Come Monday at 3—sorry, Tuesday.” What is current?
Explained answer. Tuesday at 3.
Why this answer earns trust. Only the day conflicts. Transfer variation: Name preserved detail.
Practice 2: Replacement
Question. “Use 40 mL, rather, 60 mL.” Which amount?
Explained answer. 60 mL.
Why this answer earns trust. Rather signals replacement for the same field. Transfer variation: Remove 40 mL from the final record.
Practice 3: Addition
Question. “Bring a ruler and also a protractor.” What is required?
Explained answer. Both items.
Why this answer earns trust. Also adds compatible information. Transfer variation: Contrast with instead.
Practice 4: Different trials
Question. Trial A uses 10 g; Trial B uses 15 g. Does 15 replace 10?
Explained answer. No.
Why this answer earns trust. The values belong to different cases. Transfer variation: Attach each label.
Practice 5: Mathematics
Question. Length changes from 9 to 11 while width stays 4. New area?
Explained answer. 44 square units.
Why this answer earns trust. Only length changes; area must be recomputed. Transfer variation: What old result becomes stale?
Practice 6: Science
Question. Heating time changes but material and starting temperature do not. What remains controlled?
Explained answer. The stated material and starting temperature remain unchanged.
Why this answer earns trust. The correction targets duration only. Transfer variation: Write the final method line.
Practice 7: Listening
Question. A room is corrected twice: 2, then 4, then 6. Which is current?
Explained answer. Room 6, if all corrections refer to the same event.
Why this answer earns trust. Each later clear correction replaces the same field. Transfer variation: Keep unchanged date and time.
Practice 8: Full reset
Question. What wording cancels the full earlier method?
Explained answer. For example, “Ignore the previous instructions and use the following method.”
Why this answer earns trust. Explicit broad scope is needed. Transfer variation: Do not infer a reset from one local change.
Practice 9: Dependency
Question. A corrected score changes an average. What must be updated?
Explained answer. The score, total, average and any conclusion using them.
Why this answer earns trust. Dependencies carry the correction forward. Transfer variation: Draw a short dependency chain.
Practice 10: Routine
Question. State the update routine.
Explained answer. Detect signal, name target and reference, classify replace/add/cancel, preserve compatible fields, consolidate and recompute dependencies.
Why this answer earns trust. The routine prevents both over- and under-correction. Transfer variation: Apply later to a mixed instruction.
Delayed transfer: prove that the learning lasts
Transfer test 1: Listening ledger
After two days, process announcements with local corrections, additions and one full cancellation. Do this after a delay, without rereading the worked examples. The purpose is to test retrieval and decision-making, not immediate imitation.
Success criterion. The final schedule contains no stale or missing fields. If the criterion is not met, return to the smallest missing decision rather than repeating the entire chapter.
Transfer test 2: Calculation repair
Update worked Mathematics solutions after one input value is corrected. Do this after a delay, without rereading the worked examples. The purpose is to test retrieval and decision-making, not immediate imitation.
Success criterion. Every dependent result is recomputed from the correction point. If the criterion is not met, return to the smallest missing decision rather than repeating the entire chapter.
Transfer test 3: Science protocol
Consolidate staged experimental instructions without merging different trials. Do this after a delay, without rereading the worked examples. The purpose is to test retrieval and decision-making, not immediate imitation.
Success criterion. Each trial retains correct variables, conditions and outcomes. If the criterion is not met, return to the smallest missing decision rather than repeating the entire chapter.
Examination control
1. Read the job before the story. Underline the command and the noun it governs. “Explain the change,” “state the word,” “find the fraction” and “identify the evidence” are different jobs even when the surrounding context is similar.
2. Separate given information from remembered information. Use only the facts supplied for the current task plus secure subject knowledge. Do not let a previous question, a familiar worksheet or an expected pattern silently become new evidence.
3. Write enough working to expose the decision. A marker or teacher should be able to see the relationship that justifies the answer. Extra sentences are not automatically stronger; the strongest working is concise, relevant and checkable.
4. Reserve a different-route check. For language, read the sentence for meaning and grammar. For mathematics, estimate or reverse the operation. For science, check the claim against the stated observation and a conservation or fair-test principle.
5. Stop when the requested job is complete. Unrequested speculation can contradict a correct answer. Add detail only when it explains the mechanism or satisfies another explicit part of the question.
Under time pressure, use a compact four-part margin routine: trigger → evidence → operation → check. Trigger names the feature that activates the method. Evidence identifies the exact words, values or observations allowed. Operation performs the language, mathematical or scientific step. Check asks whether the final statement answers the requested job, preserves units or referents, and avoids a stronger claim than the evidence supports.
A compact error log
After practice, do not record only “careless mistake.” Name the broken decision. Useful labels include trigger missed, evidence imported, relationship reversed, referent lost, unit dropped, operation correct but job wrong, and check repeated the same route. Add one prevention cue beside the label. A short accurate log is more useful than a long emotional account because it tells the learner what to do on the next item.
Review the log after two days and again after a week. Reattempt only one or two representative items first. If the method transfers, move to a mixed set. If it fails, repair the exact link between trigger and operation. This spacing matters because a solution can feel obvious while it is still visible and disappear when the page is closed.
Notes for parents and tutors
Use a small field table—who, what, when, where, quantity and condition. Cross out only the field explicitly corrected.
Contrast “instead” with “also.” Replacement and addition become easier to hear when the learner must name the signal.
After any value correction, ask “what depends on this?” The habit prevents stale totals and conclusions.
The adult’s most useful question is not “Why were you careless?” but “Which decision did the evidence require?” Ask the learner to point to the controlling word, value, relationship or observation. If the learner can explain that link, reduce support. If the learner cannot, model one example and then change the surface details for the next attempt.
Frequently asked questions
Does a correction cancel everything said earlier?
Usually no; it replaces the conflicting detail within its stated scope.
What happens to unchanged details?
They remain active unless explicitly cancelled or made incompatible.
How is an addition different?
An addition keeps the earlier detail and adds another compatible requirement.
When can the whole instruction be discarded?
When the source clearly cancels or restarts the earlier instruction.
Does a later value always replace an earlier one?
No; first confirm that both values refer to the same case and field.
What must happen after a numerical correction?
Recompute every downstream total, graph point and conclusion that used the old value.
Continue through the verified PSLE English route, PSLE Mathematics route and PSLE Science route. The correction-scope routine transfers across listening, calculations and investigations.
Next routes
Return to the complete volume directory to locate the series, use the original PSLE Learning Guide for the foundation route, and continue through PSLE English, Mathematics and Science for verified subject guidance. The next useful task is a mixed set in which this idea is sometimes relevant and sometimes irrelevant; that is the point at which a learner must choose, not merely copy.