# A/B-Tests

A/B tests compare your base configuration against one test variant in live traffic.

They help you validate changes before rollout.

### Resource usage and number of tests

* Thesaurus
* Stopwords
* Preprocessor Entries
* Trash Can Entries
* Campaigns
* Search Algorithm Settings
* Result listing Settings
* Personalization (except for (de)activating the module)
* Semantic Enhancer
* Facets & ASN: Filters
* Single Word Search
* AtlasAI
* Ranking Rules, but with the following exceptions:
  * Ranking Rules are only A/B testable for the scopes 'Search' and 'Navigation', not for the scope 'Suggest'.
  * The ranking for the suggest module will always use the Ranking Rules from the base variant and never apply changes from the B variant.

Regular A/B tests require one additional in-memory copy of the configuration per test.

Ranking rule tests require one additional ranked product list.

You can create multiple A/B tests.

More parallel tests need more traffic.

That means each test usually needs longer to reach reliable results.

### Support overview

#### Fully supported

These features support A/B testing without known module-specific limits:

* Thesaurus
* Stop Words
* Preprocessor entries
* Trash entries
* Campaigns
* Result Listing
* Semantic Enhancer
* Single Word Search
* Atlas AI
* Vector Search
* Filters

#### Limited support

These features support A/B testing with restrictions:

* **Personalization**
  * Personalization settings are supported
  * Activating or deactivating the module is not supported
* **Ranking rules**
  * Supported for **Search** and **Navigation**
  * Not supported for **Suggest**
  * Suggest always uses the base variant
* **GPT Synonyms**
  * You can activate or deactivate the module
  * You can choose whether to apply pending synonyms
  * You can add, modify, and delete synonyms
  * You can access synonym generation in the Cockpit
  * Other general settings on that page stay disabled
* **Recommendations**
  * Manual recommendations are supported
  * Other recommendation types are not supported
  * Matrix edits are not supported
* **Search Algorithm**
  * Standard search settings are supported
  * Exact Search support is still being verified

#### Not supported

These features do not support A/B testing:

* ASO
* Field settings
* Geo
* CSI
* Suggest
* Import and database settings

### Important note

Send the `sid` parameter with every request.

`sid` contains the session ID that assigns each request to variant A or B.

Without `sid`, requests cannot be assigned reliably.


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