There is a hierarchical set of rules that determines how leads are assigned.
For example, if a team member sends traffic using their own referral code in the link, e.g. from a Facebook advert, then this will always be assigned to that user.
Following this are other rules that can assign leads based on the property being viewed.
If the lead is still unassigned, agent sales territory area can be set up to assign leads to agents based on their defined areas.
Finally, the round robin method is the last option, which allows selected agents to participate in the various round robin distribution methods.