Wikipedia: "The threshold for inclusion is verifiability, not truth" — four claim types always need inline citations

Quote (Wikipedia WP:V):

"The threshold for inclusion in Wikipedia is verifiability, not truth — whether readers can check that material in Wikipedia has already been published by a reliable source."

Source: https://en.wikipedia.org/wiki/Wikipedia:Verifiability

Confidence: Verified.

The four claim types that always need inline citations (per WP:V):

1. Direct quotations
2. Contentious material about living persons
3. Anything challenged or likely to be challenged
4. Statistics

Why "verifiability not truth" is the right model for business writing: the writer doesn't have to be omniscient — only honest about where claims come from. Wikipedia is the largest-scale working example of "every claim → reliable source" at internet scale.

See Wikipedia verifiability policy: all challenged material must carry an inline citation to a reliable published source (the earlier KB entry) for the broader framing in brief 3 (KB-backed websites). Pairs with BBC Editorial Guidelines §3.2.2: "All BBC output...must be well sourced, based on sound evidence, thoroughly tested" and the operational CANDID REFERENCE: 7-label confidence taxonomy — Verified / Industry-consensus / Single-source / Estimated / Author's view / Contested / Stale.