Q:

What is a physical data flow diagram?

A:

Quick Answer

A physical data flow diagram is a model that shows the implementation of an information system that transports data from entry to exit. The purpose of this diagram is to display a visual reference during the system's design without excessive jargon or wording.

Continue Reading

Full Answer

Physical data flow diagrams are one of two diagrams common to information systems. The other type is a logical data flow diagram, which focuses on how the system operates.

Since the path that data travels through in an information system can be complex, different shapes are used to outline the path. A square is used to indicate external entities, which include sources of data. Rounded rectangles are used to represent processes that the data undergoes through a system. Open-ended rectangles represent data storage sites, which can be electronic or physical. To indicate the flow of data through the system, arrows are used. In cases where a decision on the data is needed, there can be multiple arrows to indicate the different pathways the data may take.

The procedures for producing a data flow diagram include identifying the internal and external entities involved, business or other functions included in the system and determining the data connections to the business functions.

Learn more about Data Graphs

Related Questions

  • Q:

    What is a compound bar graph?

    A:

    A compound bar graph breaks down data by splitting the columns to represent information comprising each bar. For example, a bar graph representing state employment rates can be turned into a compound bar graph by subdividing each state bar into columns to show unemployment percentages based on gender or race.

    Full Answer >
    Filed Under:
  • Q:

    What is the textual form of presenting data?

    A:

    The textual form of presenting data uses paragraph form to represent the information. This style of reporting is appropriate in academic reports as well as in scientific journals. The paper generally includes other representations of the data, such as charts or graphs, to better communicate with the reader.

    Full Answer >
    Filed Under:
  • Q:

    What is a data table?

    A:

    A data table works to provide relational information. Those creating a table use columns and rows to arrange the various data.

    Full Answer >
    Filed Under:
  • Q:

    What are block and schematic diagrams?

    A:

    Schematic diagrams show detailed drawings and information of the individual parts that a system or machine consist of and how they interact. Block diagrams describe a system by visually describing, using blocks and arrows, how each individual part interacts with the system as a whole.

    Full Answer >
    Filed Under:

Explore