Choose one question
Write a falsifiable hypothesis and select one variable, such as hook, visual or offer. Describe the control and each distinct variant. If several elements change together, the result cannot isolate which change caused the difference.
Set the rules in advance
Record the primary metric, test duration, sample requirement, minimum meaningful improvement and guardrails. Hold audience, placement, landing page and bidding conditions as constant as practical. Use randomized, non-overlapping groups when the platform supports them.
Allocate and interpret carefully
The worksheet divides the entered budget evenly across the control and variants and across the entered days. This is a planning allocation; normal platform delivery may be uneven. Do not declare a winner from early fluctuations. Testing several variants needs a multiple-comparison method beyond a simple two-arm significance check.