Multiple Technicians Assigned to One Ticket

I have had multiple cases where this feature would be extremely useful, but I'll just use one that would be used every day. Out IT structure is split in such a way that new user accounts are handled by infrastructure staff, but actual desktop setup and end user training are handled by help desk staff. Instead of passing the ticket back and forth if new things are needed, a configuration was missed, etc., make it so that multiple techs can be assigned to the ticket. The ticket can only be fully closed when all technicians have "completed/closed" their portion of the ticket.