1. State briefly three refactoring types with one example for every type.

2. Describe the different types of software requirements and discuss the difference between them.

3. Explain briefly the main elements and kinds of relationships involved in the UML use case. Also, give a small example of use case diagram including the main elements.

4. Define briefly software evolution activities and give two evolution examples.

5. Explain briefly the difference between these two elements of a UML class diagram: aggregation and composition. Provide also an example of a small UML class diagram including aggregation, composition and generalization relationships