I would like to create a random control group to test the uplift of our cross-sell efforts. I figured an easy way to do this would be to use the Audience Split journey step. Branch 1 = Control Group and Branch 2 = Test Group
The challenge: How do I use the branches to create the two groups? I'm assuming I would use a segment to confirm a contact participated in a journey, which is easy enough. I am struggling to find an attribute or behavioral filter that will allow me to determine which contacts went to branch 1 vs. branch 2. Is there a way to do this?
Or is there a completely different way to do this?