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)?

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

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

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

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

Rounded rectangle (B) Signup and view all the answers

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

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

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

To provide a visual representation of the system's components and data flows. (B) 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.