Make the line and its crossings visible

A bright line only works if you can clearly tell when it is crossed — so track it.

Why it works

The power of a bright line comes from its unambiguous status, but that status has to be observable to function. Tracking adherence makes the line’s state concrete and provides feedback, which both reinforces the rule and prevents the slow drift where a "clear" rule quietly erodes into a vague one without you noticing.

How to do it

1. Record each day whether the line held — a simple yes/no, not a degree.
2. Review the record weekly to catch early drift before the rule blurs.
3. Keep the record somewhere visible so the line stays salient between decisions.

Evidence

Grounded in self-monitoring research, where tracking a target behavior reliably improves adherence through increased awareness and feedback. The application to bright lines is direct. (rct)

Tracking aids adherence but can become its own pressure; keep it lightweight so monitoring does not become the burden.

Sources

• Michie et al. (2009), self-monitoring as an effective behavior-change technique (meta-analysis), Health Psychology

Common mistake

Setting a bright line and never tracking it, so the rule silently softens over weeks until it is back to vague moderation.