When you create an Optimize session, you must select an audience level for that session. An Optimize session works at a single audience level. If your company uses Campaign to communicate with contacts at different audience levels (for example, customer, household, and account audience levels), you must create a separate Optimize session for each audience level that you want to optimize.

The audience level you select for a session becomes a field in the proposed contacts table (PCT) and optimized contacts table (OCT). This field defines the type of contact that ultimately receives communication from your organization.