Summary
The object design activity should produce a complete and tested design of the system. The precise system and internal object structure as well as the reuse structure are defined in this activity. Relevant parts of the object models are mapped to SDL concept and then completed in an SDL process design activity with design use cases as the main input. This is done iteratively by starting with a initial set of essential use cases, making that part of the design complete and then testing the design (verifying it against the use cases). The activity is finished when all use cases have been implemented and the final design has been tested against all the use cases.