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      What is Concurrent Assignment Ceiling (Overlay Cap)?

      The Concurrent Assignment Ceiling field on the Features tab for your Site determines the number of Campaigns that a visitor can be assigned to. This means that for Overlay Campaigns–Campaigns that allow visitors to be assigned to more than one Campaign at a time–the Concurrent Assignment Ceiling field determines how many Campaigns that visitor can be assigned to.

      Visitors may be assigned to one Campaign in each Set that doesn't allow overlay and multiple Campaigns in each Set that allows overlay. The following lists each Campaign Set and their overlay status:

      • The Experiments Set allows visitors to be assigned to only one of the Experiment Campaigns within the Set at a time. The overlay setting for this Set cannot be modified.
      • The Origin Experiments Set defaults to allowing visitors to be assigned to only one Origin Experiment Campaign at a time. The overlay setting for this Set can be modified by the Help Desk (helpdesk@sitespect.com or +1-844-859-1900) to allow visitors to be assigned to multiple Origin Experiment Campaigns simultaneously. This Set is present only when the Origin Experiments feature is enabled.
      • The Personalization Set allows visitors to be assigned to multiple Personalization Campaigns simultaneously. The overlay setting for this Set cannot be modified.

      You can create new Experiment or Personalization Sets, if you have the required privileges. It’s important to understand how overlay works. To understand how a new visitor to your site is assigned when you have created a combination of overlay and non-overlay Sets, provided there are no Audiences that restrict the visitors assignment, consider the following:

      Set One, a non-overlay Set that contains four Campaigns:

      • Campaign 1
      • Campaign 2
      • Campaign 3
      • Campaign 4

      Set Two, another non-overlay Set that contains two Campaigns:

      • Campaign 5
      • Campaign 6

      Set Three, an overlay Campaign that contains four Campaigns:

      • Campaign 7
      • Campaign 8
      • Campaign 9
      • Campaign 10

      A visitor who is not restricted by Audiences will be assigned to a total of six Campaigns as follows:

      • 1 Campaign in Set One, because Set One is a non-overlay Set
      • 1 Campaign in Set Two, because Set Two is a non-overlay Set
      • 4 Campaigns in Set Three (all of them), because Set Three is an overlay Set