Question: 6. User interaction modeling involves use case modeling and sequence diagram approaches. Explain why this is important. 7. Explain what behavioral models are used for

6. User interaction modeling involves use case modeling and sequence diagram approaches. Explain why this is important.

7. Explain what behavioral models are used for and why are they important.

8. When describing a system, explain why you may have to start the design of the system architecture before the requirements specification is complete.

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