Figure 5-15 shows a set of use cases for the patient and physician actors. Answer the following questions and/or complete the following exercises:

1. Which use do cases include which other use cases? Modify the diagram to incorporate included relationships.

2. Consider the use cases View/respond to alert and View history. Both actors share the latter, but each has a different version of the former. Why do the actors have different versions of the View/respond to alert use case? Would the diagram be incorrect if each actor had his own version of the View history use case? Why or why not?

3. Develop an SSD for the View history use case. Assume that the system will automatically display the most recent glucose level, which is updated at five-minute intervals by default. Assume further that the user can ask the system to view glucose levels during a user-specified time period and that the levels can be displayed in a tabular form or as a graph.