Reviewed and updated: 21 July 2026.
An evidence matrix connects a question or finding to the transcript passages and other sources that support, qualify or contradict it. It prevents selective quotation and makes the path from interview to conclusion visible.
Begin with a defined question
State the research, investigation or business question before coding evidence. A broad topic encourages vague themes; a clear question makes relevance and gaps easier to judge.
Design balanced columns
| Field | Purpose |
|---|---|
| Claim or theme | Defined proposition being assessed |
| Supporting evidence | Timestamped quotations and other sources |
| Contrary evidence | Material that weakens or challenges the claim |
| Source status | Direct, reported, documentary or verified |
| Context | Role, period, setting and limitations |
| Analyst interpretation | Reasoned meaning kept separate from quotation |
| Gap | Evidence or interview still required |
Correct quotations against the audio
Check material wording, speaker identity, names, figures and negation. Preserve uncertainty and incomplete speech. An edited quotation should not silently improve grammar in a way that changes meaning.
Keep evidence and interpretation separate
Store the participant's words or a close source-labelled paraphrase in one field. Add analysis in another. This allows reviewers to challenge the interpretation without losing the original evidence.
Weight evidence transparently
Frequency is not the same as importance or truth. Consider:
- Participant role and basis of knowledge.
- First-hand versus second-hand account.
- Timing and relevance to the question.
- Consistency with documents or data.
- Sample and recruitment limitations.
- Possible incentives or missing perspectives.
Preserve contradictions
Do not average opposing accounts into a neutral-sounding summary. Show the disagreement, sources and evidence needed to resolve it. Where it remains unresolved, reflect that in the conclusion.
Use a gap register
Turn missing evidence into specific follow-up actions with an owner, source and deadline. A matrix is more useful when it reveals what would change the conclusion.
Control versions and access
Record the transcript version, coding date, analyst and reviewer. Restrict sensitive interviews and use de-identified extracts where possible. Mark superseded matrices without destroying required audit history.
How NERALVO Halo fits
NERALVO Halo can capture authorised interviews and DOWAY can make passages searchable. Human analysis must preserve provenance, contradiction and context.
Bottom line
A trustworthy evidence matrix shows why a conclusion was reached, which evidence challenges it and what new information could change it.
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