Maintain multiple models that represent the same system at different stages of development, testing, and production.

Migrate new and changed objects through the different model versions.

Synchronize models used for parallel development so that all objects in one model are the same version as equivalent objects in the other model.

Migrate new and changed objects back and forth between models on a regular basis.

Reuse and synchronize common objects.

Migrate changed common objects from the common objects model to each development model where they are used.

Synchronize models with objects that are logically the same but were initially implemented independently.

Adopt objects that are logically the same, and then migrate the equivalent objects to synchronize object versions.