Evidence Hierarchies and When to Apply Them
Launch library · evergreen read
Some fields rank evidence quite formally, placing certain kinds of records firmly above others in terms of reliability. Narrative writing rarely has such a rigid ladder to climb, but an informal hierarchy still helps: contemporaneous documents generally outweigh later recollection, and multiple independent sources outweigh a single strong one alone.
Applying a hierarchy does not mean discarding weaker evidence outright the moment it appears. It means being explicit, in your own private reasoning and sometimes directly on the page, about why one piece of evidence is doing more work in a claim than another piece is.
The goal throughout is proportion rather than strict exclusion: giving each source the weight it has genuinely earned, and being ready to explain that weighting clearly if a reader or an editor ever asks you to. That kind of transparency is rarely expected by readers, but it consistently strengthens a piece of writing that might otherwise feel more assertive than it has earned the right to be.