Research Systems

When an Evidence Matrix Is Better Than a Folder of Documents

Folders store documents. An evidence matrix helps answer questions across documents. The difference matters when many sources touch the same issue.

Use a matrix when the same question appears in many sources

If ten records each contain one piece of the answer, rereading the folder every time is inefficient. A matrix can connect the issue to each relevant source and summarize what that source contributes.

DDPW principle: The matrix should point back to the evidence, not replace it.

Separate source date from event date

A document created later may describe an earlier event. Tracking both dates helps prevent chronology errors and makes conflicting accounts easier to compare.

Record contradictions explicitly

If two sources disagree, give the conflict a visible place in the system. This is more useful than writing one polished narrative that quietly hides the disagreement.

Keep a stable locator

Each row should lead back to the underlying document, file path, record ID or web source. The matrix is most valuable when verification takes seconds instead of another search.

Use the matrix to support synthesis

Once the evidence is organized by issue, date and source, summaries and research briefs become easier to write without losing traceability.

Explore Evidence Matrix & Source Indexing →