Ask participants to list their behaviours when they felt they were excluded by the group (e.g. I would not participate in the discussion if I felt excluded).
Repeat this procedure for the times they felt included (e.g., I might talk to the person next to me if I felt included).
Watch that participants actually use behavioural words; people have a tendency to use feeling words again. For example, if someone says “I would act angry,” ask them how they would act when they felt angry.