How does the Round Robin assignment mode work?

In the Round Robin mode, records are assigned one by one to group members. The first saved record is assigned to the first selected member, the second saved record to the second member, and so on. After a round of assignments to all the members is completed, the assignment process starts with the first member again. 

It is basically a queue of members waiting for a record to be assigned to them.

To know more about Assignment Rules, click here.