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Data Modeling

In: Computers and Technology

Submitted By bakory1
Words 7261
Pages 30
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 depicts the flow of data through a system and the work or processing performed by that system. The

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