When wanting to implement large changes to a community, it's recommend to first test the new changes with certain user groups to receive early feedback.
The default user groups are new, full, active, and ambassador with users being able to move to different groups based on the amount of posts they make. Each group is has an A group and B group for further testing.
Place new members into specific user groups based on chance
Each user group has an A and B segment
Default user groups include Ambassador (20h activity in last month + 200 posts), Active Member (12h activity in last month + 100 posts), Full Member (3 Posts), and New Member (All Posts Moderated)
Daily, automatically run a cron to move users into the correct user group based on the amount of posts and removes them from the group they were previously in if they now qualify for a new activity group