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placedOrder.confirm(...)which returns aConfirmedOrder, or some such. That would be perhaps the extent of "communication". Otherwise I don't really know what you mean.Orderis the Aggregate Root, and other classes are just its states. You are thinking that they are all Aggregate Roots in different Aggregates. Ok, so following your thought, if thePlacedOrderandConfirmedOrderare both Aggregate Roots in separate Aggregates, and theplacedOrder.confirm(...)returns aConfirmedOrder, would it violate theAggregate Root must reference other Aggregate Root by its IDprinciple?PlacedOrderdoesn't necessarily has to referenceConfirmedOrderat all. It may just create it. Just to be clear, I don't agree with that "ID" rule at all in the first place. We're not a database, we don't work with primary keys and foreign keys. I know it's in the Blue Book, but even Evans has distanced himself a bit from these concrete things a bit over the years. So I don't think it is a "must" for DDD. YMMV