How to Create a Mutually Exclusive Group

What are Mutually Exclusive Groups?

Mutually exclusive groups ensure that visitors participate in only one experiment within a group of related tests. This feature is crucial when you need to maintain data clarity and prevent interference between multiple experiments running simultaneously.

IMPORTANT NOTE:

• When using mutually exclusive groups, your total available traffic gets divided between experiments
• Example: With 1000 daily visitors, two mutually exclusive tests at 50% each means 500 daily visitors per test

When to Use Mutually Exclusive Groups?

Consider using mutually exclusive groups in these scenarios:

1. Multiple Tests on the Same Page
   • When running several experiments on a single page
   • Example: Testing both hero image and headline variations simultaneously
2. Related User Journey Tests
   • When experiments overlap in a conversion funnel
   • Example: Testing different checkout page layouts while also testing payment option displays

How to Create a Mutually Exclusive Group

1. Navigate to the Experiments page
   
2. Click the Mutually Exclusive button in the top right corner
3. Click on Add Group

Adding Campaigns to a Mutually Exclusive Group

1. Use the dropdown menu under "Choose a test campaign" to select experiments
2. Click Add to Group to add the selected campaign
3. Configure traffic weightage 
   • Example distributions:
   • Equal split: 50-50 between two tests
   • Priority split: 70-30 favoring critical tests
4. You can add multiple campaigns to each priority group

Understanding Priority Groups

• Priority groups determine the order in which tests are assigned to visitors
• Tests in Priority Group 1 take precedence over tests in Priority Group 2 
• Lower priority groups only considered if higher ones don't match
• You can add new priority groups by clicking Add New Group

Example: Homepage Testing Plan

Priority Group 1 

- Test A: Hero Image Variations (50% traffic)

- Test B: Headline Copy Test (50% traffic)

Priority Group 2 

- Test C: CTA Button Colors (100% traffic)

How visitors are assigned:

1. Visitor lands on homepage
2. System checks Priority Group 1:
   • 50% chance of seeing Hero Image Test
   • 50% chance of seeing Headline Copy Test
3. If visitor doesn't qualify for Group 1:
   • They'll see the CTA button test

Key Points

• Individual experiment rules (e.g. targeting, traffic allocation) are checked first
• If eligible, they're assigned to ONE test within their matched priority group
• Only if visitor doesn't qualify for higher priority groups, they move to lower ones
• Visitor assignments remain consistent throughout their journey for reliable data collection