The playbook
Negative Keywords: Metrics and Measurement
Measure negative keywords by defining irrelevant spend reduced without losing useful demand precisely enough that two people can reproduce the result from the same records. Keep the reporting unit, date basis, and scope visible. Without those definitions, a change in the report may reflect a changed calculation rather than a changed customer outcome.
Put the task in context
Review the full query before excluding a term. A word such as “free” may appear in both irrelevant searches and a legitimate query about an advertised free consultation. Choose exclusion scope carefully and inspect useful demand that could be blocked.
Create a metric definition
| Definition field | What it must explain |
|---|---|
| Measure | irrelevant spend reduced without losing useful demand |
| Unit | What one campaign or conversion record or completed outcome represents |
| Included records | The scope identified by search term and reason |
| Date basis | The event date or period used to include a record |
| Exclusions | Tests, duplicates, or other records outside the agreed definition |
| Source owner | budget owner |
Separate delivery checks from outcome measures
A delivery check asks whether the team completed a specific task, such as review search terms alongside lead quality. An outcome measure asks what happened for the user or business afterward. Keep both visible. Completing the task is useful evidence of execution, but it does not by itself prove that the broader outcome improved.
Worked arithmetic example
Suppose an illustrative review includes 80 eligible records, and 60 satisfy the explicitly defined completion condition. The completion share is 60 ÷ 80 × 100 = 75%. This is hypothetical arithmetic, not an industry benchmark or a predicted improvement. It describes only the population and condition you defined.
For negative keywords, explain the condition before applying that calculation. If the question is whether the team can check exclusion scope and possible useful matches, a record counts only when the evidence demonstrates that condition. Do not replace missing outcomes with successful ones just to complete a report.
Compare like with like
Keep the scope, date basis, and exclusions consistent between observations. If reason changes meaning between periods, note the change and rebuild a comparable view where possible. A rate can also move because the composition of the underlying group changed, even when individual performance did not.
Investigate an unexpected result
- Check whether the underlying search term records are complete.
- Look for this known failure: blocking a broad word that also appears in valuable queries.
- Verify that the process still includes: identify patterns that clearly do not match the offer.
- Reconcile a sample with the original record before changing the operating plan.
Use the report to choose an action
If the evidence supports a correction, use precise exclusions and review their effect. Record when the change occurred and what should be checked next. Keep uncertainty visible when the sample is small or the observation period is incomplete. The purpose of measurement is a better decision about irrelevant spend reduced without losing useful demand, not a favorable-looking number.
Choose an observation period that reflects the buying process. Immediate clicks, later inquiries, and completed sales happen at different times. Keep the attribution window and any incomplete outcomes visible when comparing campaigns.
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