What to test, how often, and when a number stops being useful.
3 branches open from this page.
Why adherence falls faster than intention, and what the shape of the curve predicts.
Continue 02Field noteSmall environmental changes that keep working when motivation does not.
Continue 03Field noteEffect sizes, drop-outs, and the difference between a result and a habit.
ContinueA 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.