Data Flow Diagram Symbols and Rules Quiz
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Questions and Answers

What is the purpose of using a use-case diagram?

  • To represent data transformations
  • To display detailed coding information
  • To visually show the functionalities of a system (correct)
  • To indicate technical specifications

    • In a library borrowing system use-case diagram, which actor interacts with functionalities like 'Search Books' and 'Borrow Book'?

  • Visitor
  • Borrower (correct)
  • Librarian
  • Customer

    • What should you focus on when presenting to technical stakeholders about a system?

  • Detailed coding information (correct)
  • Clarity in DFD
  • Top-down decomposition
  • High-level functionalities

    • Which symbol in Data Flow Diagrams (DFD) represents a transformation of data?

    <p>Rounded rectangle</p> Signup and view all the answers

    What should be considered when tailoring the level of detail in a presentation to a general audience?

    <p>Maintain a clear and concise tone</p> Signup and view all the answers

    What do sequence diagrams help to visualize in software systems?

    <p>Interaction between objects over time</p> Signup and view all the answers

    What is the purpose of establishing Data Stores in a DFD?

    <p>To store data within the system and indicate how it is accessed and modified</p> Signup and view all the answers

    In a Context Diagram (Level 0), what shape is typically used to represent the entire system?

    <p>Rounded rectangle</p> Signup and view all the answers

    What is the recommended approach for decomposing a system in DFDs?

    <p>Top-down decomposition</p> Signup and view all the answers

    Why is ensuring data flow balance important in DFDs?

    <p>To maintain consistency across the DFD hierarchy</p> Signup and view all the answers

    What is a key tip for reviewing and refining a DFD?

    <p>Double-check for accuracy and completeness</p> Signup and view all the answers

    Why is clarity important when creating a Data Flow Diagram?

    <p>To ensure easy understanding of the diagram</p> Signup and view all the answers

    Which of the following statements is true about data flows in a Data Flow Diagram (DFD)?

    <p>All data flows must originate and terminate at a process</p> Signup and view all the answers

    What is the purpose of the top-down decomposition approach in developing DFDs?

    <p>To break down a system into smaller, more manageable components</p> Signup and view all the answers

    Which of the following DFD levels shows the entire system as a single process?

    <p>Context Diagram (Level 0)</p> Signup and view all the answers

    What is the purpose of the balancing step in developing DFDs?

    <p>To ensure that inputs and outputs are consistent across DFD levels</p> Signup and view all the answers

    Which of the following statements is true about external entities in a DFD?

    <p>External entities must be connected to a process by a data flow</p> Signup and view all the answers

    What is the first step in developing a DFD, according to the text?

    <p>Define the system scope</p> Signup and view all the answers

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