What's inside
- Twelve questions in four groups: the decision, the design, running it and the rules, each with why it matters and what a good answer looks like
- A sign-off block for owner, regions, dates and approver
- A design summary to fill in: expected effect, pre-period fit, smallest detectable effect, placebo result and cost
- What to do when a check fails
Who it's for
Marketing, analytics and media teams planning a geo holdout or regional test, and the people who approve them.
How to use it
- Work through it with the person who'll approve the result.
- Don't launch until all twelve have a good answer.
- Attach the signed sheet to the test plan, and read out only on the agreed date.
Related reading
- Design the test before you spend the budget
- What a placebo test tells you that a p-value can't
- Don't peek: why early test results lie
Free to use within your organisation. Please don't resell or republish it. Download terms

