| Non-substantive correction |
An error that does not change the meaning (spelling, a link). |
Corrected without a note, or with a brief note when needed. |
| Partial information correction |
New information that affects the details without changing the rating. |
An "Update:" notice at the head of the material, with the date and a description of the change. |
| Substantive correction |
An error or new information that changes the understanding of the claim or its conclusion. |
A prominent correction box at the head of the material, plus an explanation of the impact on the conclusion. |
| Retraction and replacement |
The material cannot be fixed by a partial or substantive correction. |
The material's page is replaced with an explanation of the retraction, plus a link to the updated version. |