> ## Documentation Index
> Fetch the complete documentation index at: https://developers.criteo.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Ad Tracking Best Practices

## Double Tracking Metrics

* Ensuring data accuracy & performance insights: Since the retailer is responsible for firing all `load`, `view`, and `click` events to Criteo, they should also track these metrics internally.

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  **Benefit**

  This allows for **cross-verification**, better **performance analysis**, and **independent optimization**.
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