Data Flow Diagram (DFD) Overview
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Questions and Answers

Which of the following best describes a process in a Data Flow Diagram (DFD)?

  • A process is a type of external entity that provides data to the system.
  • A process receives input data and produces output with a different content or form. (correct)
  • A process receives input data and produces output with the same content or form.
  • A process does not receive any input data or produce any output.

What is the purpose of using a Data Flow Diagram (DFD)?

  • To document the programming code of a system.
  • To represent the physical components of a system.
  • To model the logical flow of data within a system. (correct)
  • To illustrate the user interface design of a system.

Which of the following statements is true about the naming convention for processes in a DFD?

  • The name consists of a noun followed by a verb.
  • There are no specific naming conventions for processes in a DFD.
  • The name consists of a verb followed by a plural noun.
  • The name consists of a verb followed by a singular noun. (correct)

What is the purpose of an external entity in a Data Flow Diagram (DFD)?

<p>To represent a source or destination of data outside the system boundaries. (D)</p> Signup and view all the answers

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

<p>External entities are represented by rectangles in a DFD. (D)</p> Signup and view all the answers

In a Data Flow Diagram (DFD), which symbol represents the transformation of data?

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

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

<p>At least one data flow must enter and exit each process symbol. (A)</p> Signup and view all the answers

What is the primary purpose of using symbols in a Data Flow Diagram (DFD)?

<p>To provide a visual representation of the system's components and data flows. (B)</p> Signup and view all the answers

Study Notes

Data Flow Diagram (DFD)

  • A visual representation of information flow within a system.

DFD Symbols

  • Four basic symbols used to represent a DFD:

Process

  • Receives input data and produces output with a different content or form.
  • Can be simple (e.g., collecting input data and saving it in the database).
  • Can be complex (e.g., producing a report containing monthly sales).
  • Every process has a unique name identifying the function it performs.
  • Process name consists of a verb followed by a singular noun.
  • Examples: Apply Payment, Calculate Commission, Verify Order.
  • At least one data-flow must enter and one data-flow must exit each process symbol.

External Entity

  • A person, department, outside organization, or other information system.
  • Provides data to the system or receives outputs from the system.
  • Represented by a rectangle.
  • Supplies or receives data, but does not process data.
  • Components outside of the boundaries of the information system.
  • Interacts with the outside world.

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Description

Learn about Data Flow Diagrams (DFD) which provide a visual representation of how information flows within a system. Explore the four basic symbols used in DFDs to represent processes, data stores, data flows, and external entities.

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