A Round Robin is a type of group quilt. You begin with a group (I believe 4-6 per RR is a good number) of people who want to participate. Each person creates a center for their quilt and then mails it to the next person on the list. Each time a RR center is received, the recipient puts another border onto the center and mails it to the next person on the list. You always mail to the same person and receive from the same person. Eventually your center returns to you with a series of additional borders on it. It's really a neat way to make a quilt. There are something like 10 groups of IRR (International Round Robin) going on right now through this board. Check them out; some of the pieces are truly beautiful.
HTH,
Odessa