8 Questions
Which of the following best describes a process in a Data Flow Diagram (DFD)?
A process receives input data and produces output with a different content or form.
What is the purpose of using a Data Flow Diagram (DFD)?
To model the logical flow of data within a system.
Which of the following statements is true about the naming convention for processes in a DFD?
The name consists of a verb followed by a singular noun.
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.
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.
In a Data Flow Diagram (DFD), which symbol represents the transformation of data?
Rounded rectangle
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.
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.
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.
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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