Evaluate source provenance, method and evidence
Judge how far a source can support a claim by checking who produced it, how information was gathered and what its limits are.
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
A survey has 40 replies from current users of a service. What can it support most directly?
What you will learn
- Identify a source's provenance and purpose
- Evaluate the relevance, reliability and scope of evidence
- Corroborate claims using suitable independent sources
Use more than a label
Provenance includes who produced a source, when, where and for what purpose. Evaluate the actual method, sample, definitions, evidence and reasoning. A source with an interest may still provide useful data; an official-looking source may still be outdated or poorly matched to the question.
Match evidence to the claim
Check whether the source directly measures the outcome, represents the people or places named and reports enough method detail to judge it. Compare with a relevant independent source. Agreement is informative only if sources do not simply repeat the same underlying data.
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
What is a strong way to corroborate a source?
Worked example
A campaign group publishes a chart claiming a new crossing reduced near-misses. What should a researcher check?
Show the worked solution
- Identify the chart's author, date, purpose and collection method.
- Check how near-misses were defined, counted and compared before and after.
- Seek suitable independent or repeated evidence and state what the chart cannot establish.
Answer The chart may be useful, but its title is not enough to establish the result. Check who observed traffic, the dates and times, the definition of near-miss, whether the same method was used before and after, and whether other changes occurred. Independent or repeated observations can corroborate the pattern. A small local chart cannot prove the same effect everywhere.
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 company report states that its new packaging cuts waste by 30%. List four source checks before relying on the figure.
Give me a hint
Inspect method, baseline, scope and the publisher's interest.
Compare my reasoning
- Check author, date and purpose.
- Inspect the waste definition, baseline and measurement method.
- Ask which products and time period are included.
- Compare with independent evidence and note any missing groups.
Check who measured waste and when; what counts as waste; the baseline and comparison period; which products or locations are included; and whether the company has disclosed its method. Then compare with independent measurements. The company's interest is relevant to evaluation but does not automatically make the figure false.
Look for these in your work
- Evaluates provenance and purpose
- Checks baseline and method
- Checks the claim's scope
- Seeks independent evidence
A national average suggests waiting times are improving, while three local users report longer delays. Explain how both sources could be useful.
Give me a hint
Compare scale, measure and sample instead of choosing one automatically.
Compare my reasoning
- State what the average can show if its data are sound.
- State what the three experiences can illustrate and cannot estimate.
- Suggest a source or method that could investigate the local difference.
A national average may show a broad pattern, but could hide differences between places or groups. Three users can reveal experiences or possible mechanisms but cannot estimate how common delays are. Local time records with a clear sample and period could test whether the national pattern fits this service area.
Look for these in your work
- Explains each source's value
- Limits each source's scope
- Suggests a focused follow-up
Two reports agree that a policy reduced energy use, but both cite the same original dataset. What does that agreement establish, and what does it not establish?
Give me a hint
Trace the evidence chain back to its origin.
Compare my reasoning
- Identify the shared source underneath both reports.
- Explain why repetition does not create a second independent measurement.
- Name another form of evidence that could test the claim.
The agreement shows that both reports interpret the shared dataset similarly; it does not provide two independent measurements. Check the original dataset's method and compare with a separate meter record, a transparent replication or another suitable source. If all sources use the same underlying data, say so.
Look for these in your work
- Traces sources to the original data
- Distinguishes repetition from independence
- Names a suitable further check
Common mistakes
- Calling a source biased and stopping the evaluation
- Assuming two websites are independent because their logos differ
- Judging reliability only by publication date or author title
What can you explain now?
A survey has 40 replies from current users of a service. What can it support most directly?
Compare with the explanation
What those respondents reported, with the sample and question wording considered.
The evidence's strongest direct use is limited to the respondents and method.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Name two features of a source that affect what its evidence can establish.
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.