IB Psychology HLTopic 5 — Research DesignPaper 3 & IACore idea~9 min read
Credibility and Transferability
Qualitative research works with small samples and methods that cannot be repeated exactly. Judging it by reliability and generalisability would condemn it before it started. So it is judged by two different standards instead — and knowing that they are equivalents, not excuses, is what separates a good answer from a shaky one.
📚 What you need to know
Credibility is the qualitative equivalent of reliability: is the research trustworthy and believable?
Transferability is a type of generalisability used with qualitative data.
Transferability is not statistical. It asks whether the insights resonate with readers and help them understand similar situations.
It depends on rich, detailed description of methods, sampling, procedure, analysis and findings.
Common experiences transfer easily; niche or idiosyncratic ones transfer poorly.
Credibility is built through triangulation, reflexivity and peer review.
The reader, not the researcher, decides whether findings transfer to their own context.
The vocabulary swap
Qualitative research is not doing something weaker than quantitative research. It is answering a different question, so it needs different quality checks. Learn these as a matched pair and you will never write “the study was unreliable” about an interview study again.
Using “reliability” to criticise an interview study is a category error. Say the research lacked credibility, and explain which technique was missing.
Credibility: is this believable?
Since qualitative research uses small samples and non-replicable methods, reliability gets reframed as trustworthiness and believability. A credible study explains its methods and materials transparently, demonstrates the competence and integrity of the researcher, and has usually been published after scrutiny such as peer review.
Technique
What it involves
Why it builds credibility
Data triangulation
Checking one dataset against another, such as an interview against a questionnaire
Findings that survive two sources are less likely to be an artefact of one method
Researcher triangulation
A second researcher checks the design, coding or interpretation
Removes the “one person’s opinion” objection
Reflexivity
Honest reflection on strengths and weaknesses in the discussion
Transparency about limitations makes the rest of the report more believable
Transparent reporting
Full description of methods and materials used
Readers can judge the process rather than take the conclusion on trust
Peer review
Independent scrutiny before publication
An external check on competence and integrity
Notice the pattern. Every credibility technique works by letting somebody else check something. Quantitative research builds trust by controlling; qualitative research builds it by showing its working.
Transferability: does this help elsewhere?
Transferability asks whether findings can be applied to other populations or contexts outside the study’s own parameters. The aim is not statistical generalisation but resonance: does the description evoke a sense of familiarity and shared understanding, so readers can judge whether it fits situations they know?
How well it transfers depends heavily on the topic. Experiences that are common across a wide population — school days, first jobs, moving house — transfer readily, because most readers have something to compare them with. Experiences that are niche or idiosyncratic, such as becoming a refugee, transfer far less easily. Research that has become outdated also transfers poorly to modern contexts.
Who decides?
Generalisation is claimed by the researcher.
Transferability is judged by the reader.
🧩 What must be described for transferability to be possible
The methods — interview type, structured or unstructured, and why.
The sampling — how participants were obtained and why they were selected.
The procedure — how the study ran, what materials were used, how it was recorded.
The analysis — how the data were analysed and why that method was chosen.
The findings — how they relate to and support the theory being investigated.
This is why qualitative reports are long. The detail is not padding — it is the mechanism. Without a thick description of context, a reader has no basis on which to decide whether the findings fit their own situation.
Worked examples
WORKED EXAMPLE
Suggest two ways to increase credibility
A student conducts six unstructured interviews about the experience of moving schools and identifies four themes. Their supervisor says the analysis is not yet credible. Suggest two techniques that would improve it, and explain how each works.
Step 1: First techniqueResearcher triangulation — ask a second person to code the transcripts independently and compare the themes they identify.
Step 2: Why it works
Agreement between two independent coders shows the themes are in the data rather than in one person’s expectations.
Step 3: Second techniqueReflexivity — keep and report a reflexive journal covering the student’s own experience of moving schools.
Step 4: Why it works
Readers can judge the interpretation knowing the researcher’s position, and transparency about limitations increases trustworthiness.
Researcher triangulation and reflexivity, each with its mechanism“explain how” means give the mechanism, not just the name
WORKED EXAMPLE
Judge the transferability
A researcher publishes a detailed qualitative study of eight people who spent their childhood in a remote religious community. Discuss the transferability of the findings.
Step 1: Note the topic type
This is an idiosyncratic experience, shared by very few people, so transferability is limited from the start.
Step 2: Say what would help
A rich, detailed description of context, methods and findings lets readers judge how far the insights apply to comparable closed communities.
Step 3: Identify what can transfer
Broader themes such as isolation, belonging and leaving a tight-knit group may resonate well beyond this specific community.
Step 4: Give the balanced verdict
Transferability of the specific experience is low; transferability of the underlying themes is moderate, provided the description is detailed enough.
Low for the specific case, higher for the underlying themes“discuss” wants both sides and a judgement, not a single verdict
💡 Exam tip
Use credibility and transferability by name whenever the study is qualitative. The vocabulary is directly assessed.
Say who judges. Transferability is decided by the reader, and stating that shows real understanding.
Name a technique when discussing credibility. Triangulation, reflexivity and peer review are the safe three.
Link rich description to transferability explicitly. It is the mechanism, not a nice extra.
Note that outdated research transfers badly — that is temporal validity showing up in qualitative clothes.
Never write that qualitative research has “lower standards”. It has different ones.
⚠ Common mix-up
Judging qualitative work by reliability. Credibility is the right standard.
Treating transferability as statistical. It is about resonance and fit, not about percentages.
Thinking the researcher decides transferability. The reader does, using the detail provided.
Confusing data and researcher triangulation. One uses different datasets, the other different people.
Assuming a bigger qualitative sample fixes everything. Depth of description matters more than headcount.
Skipping the description of analysis. Without it, nobody can judge whether the themes were earned.
Up next: Sampling Techniques and Who Takes Part — the practical decision that quietly determines almost everything discussed on the last three pages.
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