| Retrieval substrate | Google Search + Gemini-style query fan-out | One prompt can split into many intent branches |
| Citation UI | Conversational answer links/source panel | Measure separately from AIO because overlap can be low |
| Query fan-out | Comparison, alternative, pricing, review, freshness branches | Branch coverage matters more than one canonical keyword |
| Personalization | Google account/location/personal intelligence possible | Same prompt can vary by user context |
| Measurement note | Evidence layer and answer surface should be separated | homepage inline share 55.1%, pricing/plans 50.3%; connect long-tail evidence to owned answer surfaces |