Checkpoints: Use-Case Realization

The use-case realization completely realizes the selected sub-flows of the use case; there is no missing behavior.
All additional requirements on the use case have been handled
All required behavior has been unambiguously distributed among the model elements participating in the use-case realization.
All exceptional cases to be considered in the current iteration have been handled.
Behavior has been distributed to the correct model elements, taking into consideration the responsibilities of the model elements.
Where several diagrams illustrate the use-case realization, the role of each is clear, and the diagrams are consistent with one another in their presentation of common behavior.

Rational Unified Process