With embedded diagrams, you can include version-controlled building block diagrams (root diagrams) within complex models under development (destination diagrams). When embedded in a destination diagram, a read-only version of the root diagram with full navigation capability is inserted into the destination diagram (along with a link to the root diagram). Whenever the root diagram is updated, the changes are propagated to all destination diagrams. As defects and requirement misses are discovered during the PIL and HIL phases, reworks are made to existing root diagrams and new root diagrams may also be created. This automated rework-capture-mechanism maintains the alignment of all SIL, PIL, and HIL diagrams keeping them all up-to-date and accurate.