This case study is about simulating a mechanical robot arm. The design model is obtained as a consequence of applying the bridge process. Similar applications on simulation could be designed in a similar fashion. The user requirements are complemented up front by a glossary of terms, each of which denotes a component of the robot arm, the target of the simulation. In addition a picture is displayed to further clarify the concept. Note that the use case model is simple. It focuses on three activities; two of which, help and test, could be generalized to any application. The third focuses on the core activity of the application. In this sense the initial use case model is a good start to design and later build the application. The scenarios include describing help and test facilities that the application offer. The object model expresses aggregation and inheritance relations, showing how commonalties could be factored out to reach more concise models.

The chapter leaves out the details of derivation to give to the reader the opportunity to apply the bridge process and check the results against the models that are presented. The exercises at the end of the chapter guide the reader in this direction