Regarding priorities, a manager from my past used a system that I liked: Each person had a set of tickets assigned to them, but there was always an unambiguous priority order. At any given time, a given worker would work on their highest-priority ticket that progress could be made on at that time. If anyone wanted to shift that worker to another ticket, then the priorities needed to be adjusted, and the worker would be notified (if they didn't do it themselves). This helped make it clear what people were expected to be working on, and made it easy to see what people were currently working on.