> Circles are ok to set up at the beginning, but many people belong in more than one circle and it gets cognitively tiring to sort people appropriately into one

> Circles are ok to set up at the beginning, but many people belong in more than one circle and it gets cognitively tiring to sort people appropriately into one-and-only-one circle. A person can belong to more than one circle (that's why you have a list of checkboxes, one per circle).