Set a rule
Decide once, for every future case.
This mockup uses fake data. Tap it to try it.
Family: Govern. Decide how the deciding goes. Example: Never use this color, or a spending cap.
When to use it
Use it to decide once, for every future case.
What a good design needs
A good design shows what the rule would have caught in the past.
How it fails
It fails when a rule is hidden, or when you cannot see what it does.