Chap9 Essay

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True/False Questions 1. A model is a representation of reality Answer: True Page: 316 LOD: Easy 2. Logical models show what a system is or does. They are implementation independent. Answer: True Page: 316 LOD: Easy 3. Logical models show how a system is implemented. Answer: False Page: 316 LOD: Medium Rationale: Logical models are implementation independent. 4. Physical models show not only what a system is or does, but also how the system is physically and technically implemented. They are implementation independent because they specify the technology. Answer: False Page: 316 LOD: Medium Rationale: Physical models are implementation dependent (not independent). 5. Logical models show not only what a system is or does, but also how the system is implemented. Answer: False Page: 316 LOD: Medium Rationale: Physical models show not only what a system is or does, but also how the system is implemented; therefore, they are implementation dependent. Logical models are implementation independent. 6. Process modeling is a technique for organizing and documenting the structure and flow of data through a system's processes and /or the logic, policies and procedures to be implemented by a system's processes. Answer: True Page: 317 LOD: Easy 7. A data flow diagram (DFD) is a tool that depicts the flow of data through a system and the work or processing performed by that system. Answer: True Page: 217 LOD: Easy 8. An entity relationship diagram (ERD) is a tool that depicts the flow of data through a system and the work or processing performed by that system. Answer: False Page: 317 LOD: Medium Rationale: A data flow diagram (DFD) is a tool that

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