# One visitor One test on Web experimentation

## Activate One visitor One test Option on Web experimentation and Personalization

To enable this option, go to:

{% stepper %}
{% step %}
Go to : **Settings > Advanced Settings** 
{% endstep %}

{% step %}
Select **1 visitor 1 test option** 
{% endstep %}

{% step %}
Check the toggle to enable it.

* If you toggle on: a visitor will see only one experiment at a time.
* If you toggle off: a visitor can see more than one experiment.
  {% endstep %}
  {% endstepper %}

{% hint style="info" %}

* Personalization and Patch scenarios are not affected and will continue to be displayed. 
* This option is compatible with the [Mutually Exclusive Experiment](/web-experimentation-and-personalization/campaign-creation-and-dashboard/mutually-exclusive-experiments-feature.md) feature. Consider that if you create several Exclusion Groups, then your visitors will only see one experiment across all the groups
  {% endhint %}

## How does the prioritization mechanism work?

* The tag evaluates eligible campaigns in ascending numerical order of their IDs.
* The first campaign where the visitor matches all targeting conditions is the one they are assigned to.
* There is no additional prioritization logic beyond this ID order.
* Suppose the visitor falls into untracked traffic for the first eligible campaign (i.e., not assigned due to traffic allocation). In that case, they may still be assigned to the next eligible campaign in the list.<br>

This mechanism works the same way on desktop and mobile browsers, as long as cookies are enabled.


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