1. Describe sequence diagrams. Include in your discussion how to read them. What does a curved message call line do?

2. What is meant by saying that UP is an iterative and incremental process?

3.  Distinguish between the Extend and Include relationships in use case diagrams. What does INCLUDE: VALIDATE CREDIT CARD mean in a use case description named PROCESS SALE? Show how to use it in the use case description normal flow section. 

4. Why is class cohesion important? How do you make sure a class is cohesive? Give an example of a class that is not cohesive.

5. Define the following terms: class, attribute, and operation. Give examples of each in a class.

6. In a communication diagram, a teacher object and course object are connected with a line. Above the line it states "CourseAttendance()" and it points to the course object from the teacher object. Another message on the line is "UpdateCreditHrsTaught()" and it points from the course object to the teacher object. Explain what this information means. Include in your answer which object is sending the messages to which object and which objects contain the methods.

7. Explain the concept of polymorphism. Give an example. 

8. Explain what is meant by the implementation model.

9. Give an explanation and an example of an object that would be an excellent candidate to diagram in an object state diagram besides the ones in your course project or text.  Give an explanation and example of an object that would be a poor candidate to diagram in an object state diagram. Justify your answers. 

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