One visitor One test on FE&R

This article explains how to activate/deactivate the 1 visitor 1 test feature in FE&R campaigns and the prioritization mechanism.

  • This option only affects Experiments (A/B Test). All Personalization and Feature management scenarios will continue to work as expected.

  • This option is compatible with Bucket Allocation. Consider that if you put several experiments inside a bucket, your visitors will only see one of those experiments.

Activate One visitor One Test Option on Feature Experimentation and Rollout

To enable this option:

1

Go to User Profile > Feature Experimentation > Feature Experimentation Settings > Environment Settings.

2

In the Settings section, check the option 1 visitor 1 experiment.

  • If you check the option: a visitor will see only one experiment at a time.

  • If you uncheck the option: a visitor can see more than one experiment

This option targets the environment (Prod or Preprod). Check this option for all the relevant environments.

How does the prioritization mechanism work on Feature Experimentation and Rollout?

  • The Decision API evaluates which campaigns are eligible for a visitor based on their context keys.

  • It then sorts the eligible campaigns by creation date, from newest to oldest.

  • The first campaign in this list is the one returned by the Decision API for that visitor.

  • There is no additional prioritization logic beyond this order.

  • If the visitor falls into untracked traffic for the first campaign (i.e., they aren't assigned to it due to traffic allocation), they may still be assigned to the next eligible campaign.

  • The feature works the same, whatever the application or device, as long as the visitor stays the same.

  • For more randomized traffic distribution, use the Bucket Allocation feature.

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