Summary
A failure to provide instructions that reflect the business truth. Smart Bidding only optimises towards the conversion actions, values and targets you configure, so a gap in reach usually traces back to inputs that misrepresent what the business actually values. Correct the conversion setup and targets, and the same strategy starts reaching the customers it was skipping.
Nitin Batra is a Google Ads Search certified professional who configures conversion values, targets and Smart Bidding strategies across live search accounts on a daily basis.
Last updated: August 23, 2026
When Smart Bidding misses potential customers, the human-in-the-loop philosophy points to a failure to provide instructions that reflect the business truth, meaning inputs like conversion values, goals and targets do not match reality.
- A failure to provide instructions that reflect the business truth.
- Insufficient manual adjustments at the keyword level.
- A failure in the underlying AI technology.
- The algorithm prioritizing clicks over conversions by default.
The correct answer is: A failure to provide instructions that reflect the business truth.
Key Takeaways
- – The likely cause of the performance gap is a failure to provide instructions that reflect the business truth, not a failure of the bidding technology.
- – Smart Bidding acts on the conversion actions, values, targets and goal settings you configure, so wrong inputs produce technically correct but commercially useless bidding.
- – The human-in-the-loop philosophy puts strategy, goal definition and value measurement with the marketer, and execution speed with the automation.
- – A common mistake is adding manual keyword bid tweaks or blaming the algorithm, when the real fix is correcting conversion values, primary conversion selection and target settings.
What does human-in-the-loop actually mean in Google Ads Smart Bidding?
It means the automation handles the auction level decisions while the marketer keeps control of the inputs and the definition of success. You decide which conversion actions count, what each one is worth, what target CPA or ROAS is acceptable and which audiences signal value. The system then executes against those instructions at a scale no manual bidder can match.
Where do I set conversion values so Smart Bidding understands business truth?
Go to Goals, Conversions, Summary and open the individual conversion action. You can set a static value, use different values for each conversion, or pass a dynamic value from the website or CRM. For lead generation, importing offline conversions or using enhanced conversions for leads gives the bidding real revenue signals instead of counting every lead the same.
Should I still adjust keyword bids manually when Smart Bidding is running?
No. Smart Bidding sets bids at auction time using signals you cannot see or edit, so keyword level bids are ignored under strategies like Target CPA, Target ROAS, Maximise Conversions and Maximise Conversion Value. Your control points are targets, budgets, conversion setup, audience signals and campaign structure.
How long should I wait before deciding Smart Bidding is underperforming?
Give any change a learning period and then judge on a full conversion cycle, usually two to four weeks depending on volume and lag. Check the Bid strategy report and the status column to see if the strategy is limited by target or budget. If the volume is genuinely short, review the target and the conversion setup before changing strategy.