Specify what the test decides
Choose the question you need answered, such as accepted target format, charge accuracy, or support clarity. A test cannot establish every future outcome. Write the observation window and the evidence required before buying the larger quantity.
Keep the budgets separate
Allocate a fixed evaluation amount and a separate uncommitted rollout estimate. Record whether the test quantity contributes to the eventual campaign requirement. Otherwise, you may double-count both the quantity delivered and the money still needed.
Use a stop condition
Decide what would make you pause: an unresolved scope mismatch, unsupported target, or unclear billing. A low test charge should not encourage repeated tests without a decision. Complete the review before funding the next phase.
Decision checklist
| Decision | What to check |
|---|---|
| Question | Decision the test supports |
| Limit | Maximum test spending |
| Gate | Evidence before rollout |
Worked example
A hypothetical campaign needs 5,000 units and tests 500 first. If those 500 count toward the same approved scope, the remaining quantity is 4,500. Budgeting another full 5,000 would unintentionally increase the campaign.
Example figures explain the decision; they are not current prices or promised results.