Separate claims, reasons, conclusions and assumptions
Trace how a source moves from reasons and evidence to a conclusion, including ideas it leaves unstated.
Exam scope and assessment notes
This is original StudyForA teaching and fictional practice, not Cambridge text, an official question or an official mark scheme. The 2026–2028 syllabus calls the written exam Component 1; the 2029–2031 syllabus calls it Paper 1 and reports no significant teaching changes. Check the syllabus for the learner's exam year and follow teacher, centre and assessment-authenticity rules. StudyForA cannot authenticate assessed work, observe collaboration, award official marks or predict a grade.
Before you begin
- Identify whether the task concerns source analysis, essay writing, team assessment or the independent research report.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which part of an argument is the conclusion?
What you will learn
- Identify a conclusion, supporting reasons and evidence
- Distinguish fact, opinion, prediction and explanation
- Explain how assumptions or counterclaims affect an argument
Map the reasoning
A conclusion is the position an argument supports; reasons explain why; evidence is information offered in support. An assumption is an unstated link that must be true for a reason to support the conclusion. A source can contain accurate facts yet make an inference those facts do not justify.
Test the connection
Ask whether each reason is relevant, whether the evidence supports it and whether another explanation fits. Consider the context and implications of the conclusion. A counterclaim is strongest when it addresses a real weakness or alternative, not when it misrepresents the other view.
Sources for this lesson
- Cambridge International AS & A Level Global Perspectives & Research 9239 syllabus · 2026–2028 Version 3
- Cambridge International AS & A Level Global Perspectives & Research 9239 syllabus update · 2026–2028
- Cambridge International AS & A Level Global Perspectives & Research 9239 syllabus · 2029–2031 Version 1
- Cambridge International 9239 subject page and exam-series notice
Pause and explain
How should you test an unstated assumption?
Worked example
A fictional article says: 'Our survey of 18 volunteers found that 14 prefer later library hours, so every student needs a library open until midnight.' Analyse its argument.
Show the worked solution
- Identify the conclusion and the evidence offered.
- Notice that volunteers at one library may not represent every student.
- State a narrower conclusion the evidence could support and what additional evidence is needed.
Answer The conclusion is that every student needs midnight hours; the evidence is 14 of 18 volunteers at one library. This small self-selected group cannot establish what all students need. It may support the narrower claim that many surveyed volunteers preferred later hours. A broader sample and evidence about usage, access and operating costs would be needed for a wider decision.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A report says, 'Three schools that installed water fountains bought fewer bottles next month; therefore fountains always eliminate plastic waste.' Identify the conclusion, evidence and one assumption.
Give me a hint
Keep the evidence's setting and time period visible.
Compare my reasoning
- State the conclusion being argued for.
- Describe exactly what the evidence observes.
- Name a link between the observation and the broad conclusion that may not hold.
The conclusion is that fountains always eliminate plastic waste. The evidence is a fall in bottle purchases at three schools during one month. The argument assumes the fountains caused the fall and that the change will occur at every school and remove all plastic-waste sources. A longer comparison and information about other changes would be needed.
Look for these in your work
- Identifies conclusion and evidence
- Preserves the evidence's scope
- Names a relevant assumption
A source predicts that a city will save money if it closes a road to traffic. What three questions would help you analyse its reasoning?
Give me a hint
Look for the basis of the prediction, the costs included and the time period.
Compare my reasoning
- Ask what data or model supports the prediction.
- Check which savings and costs are included.
- Check the assumptions about users, time and alternative routes.
Ask what past data or model supports the prediction; whether setup, enforcement, transit and business costs are included; and what time period, traffic response and alternative-route assumptions the model uses. The prediction is not an observed saving, so its assumptions and uncertainty need to be visible.
Look for these in your work
- Checks the evidence base
- Checks cost coverage
- Checks assumptions and timeframe
A student opposes a proposal because it may make the journey longer for wheelchair users. Explain how to use that counterclaim fairly.
Give me a hint
Represent the proposed benefit accurately and test access with evidence.
Compare my reasoning
- State the original proposal's aim fairly.
- Explain the access concern and whom it may affect.
- Name evidence or a design change that could test or address the concern.
First state the proposal's intended benefit without exaggeration. Then explain how a longer or less accessible journey could affect wheelchair users. Check route distances, surface and crossing access with affected users, and consider whether accessible alternatives preserve the intended benefit. The counterclaim tests an important consequence; it does not by itself establish that the proposal has no value.
Look for these in your work
- Fairly represents both positions
- Explains the implication
- Names a relevant evidence check
Common mistakes
- Treating a statistic as proof without checking its sample
- Confusing a prediction with an observed fact
- Rejecting a whole argument because one assumption is weak
What can you explain now?
Which part of an argument is the conclusion?
Compare with the explanation
The position that the reasons are intended to support.
The conclusion is the main claim or judgement reached by the reasoning.
After trying it yourself, choose your next review. This is your self-assessment.
Your review choice appears on Today. Sign in to sync it across devices.
Make it stick
What is the difference between a reason and evidence?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.