The users make software Objects to represent the real Items in the system. This allows all data for the item to be stored and found with a single click on the Object. It also stores all the changes and activities done across the Item life.
Systems are made up of many items working together. Users place Objects in relationships to capture their combined properties.
DAD takes the place of many existing tools across the lifetime of the system. SIM and model evolved in unison, so data is always up-to date.
Users create Layers in the SIM to show combined physical and functional aspects so that specialist teams may work together and cooperate. Major uses of this feature are relating hardware and software and isolation management.