What to test, how often, and when a number stops being useful.
A standing column returns every issue. The form is fixed so the content can change without the reader having to relearn the page.
The column returns every issue with the same question and different evidence. It is deliberately narrow: one lever, one method, one practical change.
A metric earns its place only if a decision changes when it moves.
The column is a standing invitation: same question every issue, different evidence each time.