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Process Modeling 1. What is the difference between logical modeling and physical modeling? Why is logical modeling more important in systems analysis? 2. What is systems thinking, and how do process models represent systems thinking? 3. What are the four symbols on a data flow diagram? 4. What is a process? Name three types of logical processes. 5. What is process decomposition, and what role does it play in process modeling? 6. What purpose does Structured English serve in process modeling?