TinkerCheckout B shows an “Only a few left!” banner.
Chapter 6 of 7
The metric moved, the business didn’t
A banner says “Only a few left!” and orders jump. The team is ready to ship, until the returns desk calls.
This chapter: What if the number you tested rises while the business doesn’t?
About this chapter
You will learn
- The primary metric is what the test is for
- Guardrail metrics watch what must not get worse
- Ship only when the guardrails hold too
Words you’ll meet
- Primary metric
- The one number a test is run to move: here, the share who buy.
- Guardrail metric
- A number that must not get worse, like returns, checked before anything ships.
Step 1 of 5
The is the number a test is run to move: here, the share who buy.
Run the banner test.