Editorial Standards and Correction Policy
Sourcing rules
| Evidence level | Definition | How it is presented |
|---|---|---|
| A | Primary source: standard text, official statistics, company filing | Stated as fact with attribution |
| B | Reputable secondary source, or vendor documentation | Attributed as reported |
| C | Estimates, ranges or industry commentary | Explicitly labelled as an estimate |
Where we disagree with a source
When two credible sources give different figures, we publish the range and explain the difference, for example a definitional change in what is counted. Presenting a single number without its definition is the most common error in industry reporting.
Updates and corrections
- Updates that add information keep the original date and note the addition.
- Corrections that change meaning are labelled and dated.
- Superseded standards references are replaced, with a note on the new edition.
- Articles are never deleted to remove an inconvenient fact.