Choose a fair research method and test a claim
Match interviews, surveys, observations and secondary data to a question, then evaluate sampling, measures and ethics.
Exam scope and assessment notes
This lesson uses original StudyForA explanations and fictional practice scenarios; it is not Cambridge text or an official assessment. The current syllabus for the learner's exam year and their centre instructions take precedence. All 22 broad themes are optional issue contexts, not 22 bodies of facts to memorise: Cambridge says topic knowledge is not assessed and candidates are not expected to experience every theme. Candidates select relevant themes with their teacher. Paper 1 / Component 1 is externally assessed. Component 2 is internally set and externally marked; use centre guidance for topic choice and submission. Component 3 is internally assessed and externally moderated; it requires a real team of two to five and centre assessment. StudyForA practice is original self-check support, not Cambridge material, an official mark scheme, an authenticated report, assessed team evidence or a predicted grade. Private candidates cannot enter for 0457; confirm the exam year, series and centre arrangements.
Before you begin
- Read the question and identify the issue, source or assessment component it concerns.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What makes a comparison more useful when testing a change?
What you will learn
- Design and carry out research
- Evaluate research methods and evidence
- Suggest how a claim could be tested
Match method to the question
A method should collect evidence relevant to the question. Interviews can explore reasons, observation can record visible behaviour, surveys can gather comparable reports, and existing datasets can show patterns over time. Each method has limits; using more than one may add useful perspectives.
Plan a fair and ethical study
Define the population, sample, measure and procedure before collecting data. Check whether participants can give informed consent, whether questions are private or sensitive, and whether identifying information is needed. Use consistent measures and report non-response and limitations.
Sources for this lesson
Pause and explain
A survey receives very few replies. What should a researcher do?
Worked example
A school wants to test whether a quiet study room is associated with fewer interruptions. Design a small fair comparison.
Show the worked solution
- Define interruption and the groups or periods to compare.
- Keep observation times and recording rules consistent.
- Protect privacy and avoid claiming more than the study shows.
Answer Record interruptions during matched study periods with the room available and unavailable, using the same observation rules and similar times. Do not record identifiable student details. Other differences, such as attendance or staffing, may affect results, so report association and limits rather than claiming proof of cause.
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 student wants to know whether a school garden changes how students view local food. Suggest one method and explain one limitation.
Give me a hint
A method can measure a reported view, behaviour or understanding; say which one.
Compare my reasoning
- Define what ‘view’ will mean in the study.
- Choose a method that can collect that evidence before and after or from a comparison group.
- State a limit such as self-selection or other influences.
Use the same short, neutral questionnaire before and after a voluntary garden activity, asking about a defined aspect of local food. A comparison group could help, but students who choose the activity may differ from others, and self-reported views do not prove long-term behaviour changed.
Look for these in your work
- Defines a measurable outcome
- Matches a method to the outcome
- Qualifies one limitation
A claim says that public signs reduce litter. Design a test that records a relevant outcome while protecting privacy.
Give me a hint
Observe litter counts in matched areas and times; there is no need to identify people.
Compare my reasoning
- Choose comparable observation areas and a baseline period.
- Use the same area size, time and litter-count rule before and after signs.
- Record other changes and avoid collecting identifiable personal data.
Select comparable areas, count specified litter items at the same times for several days before and after signs are installed, and use the same recording method. Note cleaning schedules, weather and visitor levels if available. Count litter only; do not photograph or identify individuals. The result may show an association, not prove signs alone caused it.
Look for these in your work
- Defines consistent observations
- Uses a baseline and comparison
- Protects privacy and states limits
A questionnaire asks, ‘You agree that the new timetable is better, don’t you?’ Rewrite it neutrally and name one improvement to sampling.
Give me a hint
Remove the suggested answer, then think about who is missing from the sample.
Compare my reasoning
- Remove language that signals the expected response.
- Offer balanced response choices or an open response.
- Invite a range of affected students rather than only friends or volunteers from one group.
A neutral item could be: ‘How, if at all, has the new timetable affected your ability to reach lessons on time?’ Add balanced choices and an open explanation. Invite a defined range of students across relevant year groups and report who responded; a convenience sample of friends may not represent everyone affected.
Look for these in your work
- Removes leading wording
- Keeps the response open and balanced
- Improves sample breadth
Common mistakes
- Using a question or measure that does not match the claim
- Treating convenience volunteers as representative
- Collecting personal information without a clear need or safeguards
What can you explain now?
What makes a comparison more useful when testing a change?
Compare with the explanation
A consistent measure and comparable conditions, with other possible influences recorded
These reduce avoidable differences and make limitations visible.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
State one way to improve a research method and one limitation that may remain.
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.