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ch6 - ch6 True/False Indicate whether the statement is true...

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ch6 True/False Indicate whether the statement is true or false. ____ 1. A DFD fragment represents the system response to a single event. ____ 2. The term “diagram 0” is used synonymously with context diagram. ____ 3. In a logical DFD, All data that flows into a process must flow out of the process or be used to generate data that flows out of the process. ____ 4. Structured English, decision tables, and decision trees are all commonly used methods of describing a process on a data flow diagram (DFD). ____ 5. The traditional approach to system development views a system as a collection of interacting objects. ____ 6. Traditional computer processes are much like procedural computer programs in that they contain instructions that execute in sequence. ____ 7. The object-oriented approach to systems development views a system as a collection of processes, some per- formed by people and some performed by the computer. ____ 8. Data flow diagrams (DFDs) can show either higher-level or lower-level views of the system. ____ 9. System boundaries are not shown clearly on context diagrams. ____ 10. Context diagrams do not usually show data stores. ____ 11. Diagram 0 summarizes an entire system or subsystem in greater detail than a context diagram. ____ 12. A data flow diagram (DFD) can be a physical system model, a logical system model, or a blend of the two. ____ 13. The key to avoiding information overload is to divide information into large and relatively dependent subsets. ____ 14. Processes on a data flow diagram (DFD) represent chunks of business or processing logic. ____ 15. A process decomposition shows the internal details of a higher-level process in more detailed form. ____ 16. Any data element that is read from a data store must have been previously written to that data store. ____ 17. Structured English is well suited to describing processes with many sequential processing steps and relatively simple control logic. ____ 18. A black hole is a repository for definitions of data flow, data elements, and data store. ____ 19. Context diagrams are usually created in parallel with event tables. ____ 20. A decision tree, a decision table, and structured English can be used interchangeably to represent program lo- gic. ____ 21. A CRUD matrix is a specialized type of activity-data matrix. ____ 22. CRUD stands for create, review, update, and delete. Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 23. How many different symbols can be used in a data flow diagram (DFD)?
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a. 2 c. 4 b. 3 d. 5 ____
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