Briefle words · Product & specs
Guardrail metric
A metric with a set limit that must not be crossed while improving the main goal, or the change doesn't ship.
Say it to an AI
Write this experiment's hypothesis as a falsifiable statement: the change, the audience, one primary metric with its baseline and target, a guardrail metric, and the threshold and duration at which we call it wrong.
How an expert would brief the stronger version of “Experiment card”.
See it
Try it as a puzzle →A flight-booking startup puts its next experiment on the board before engineers build it.
Why: B tracks refund requests as a guardrail; A mixes engagement, bookings and satisfaction with no primary metric.
Related words
Room 2 · Problems & users
Learn “Guardrail metric” in a five-minute lesson