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# A/B Testing Publisher Placements

## Introduction

A/B testing helps publishers compare two placement or layout options to see which performs better. This article covers a simple approach.

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## Planning a Test

1. Choose a clear goal such as higher CTR or better viewability.
2. Identify one element to change, like the position or size of a single unit.
3. Decide how long to run the test to gather enough data.

[EDITOR: Add screenshot of a report comparing two ad units or layouts over time]

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## Running and Measuring

* Create two versions of the placement and ensure traffic is split fairly.
* Use reports grouped by ad unit or tag to track performance separately.
* Focus on a small number of key metrics instead of many minor ones.

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## Applying Results

* Keep the version that consistently meets your goal better.
* Apply successful patterns to similar areas on your sites.
* Document tests so you do not repeat experiments that already have clear outcomes.
 
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## Related Articles

[Monitoring Ad Performance in the Publisher Dashboard](https://helpdesk.ezmob.com/en/article/monitoring-ad-performance-in-the-publisher-dashboard-1dam311)
[Site-Level vs Ad-Unit-Level Publisher Reports](https://helpdesk.ezmob.com/en/article/site-level-vs-ad-unit-level-publisher-reports-1tt0s3e)
[Optimizing Ad Density on Publisher Pages](https://helpdesk.ezmob.com/en/article/optimizing-ad-density-on-publisher-pages-1ci6f0n)
[Low CTR Troubleshooting for Publishers](https://helpdesk.ezmob.com/en/article/low-ctr-troubleshooting-for-publishers-gzgapr)