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Data Flow Diagram

Data flow diagram is a well known approach to visualize the data processing in business analysis field. A data flow diagram is strong in illustrating the relationship of processes, data stores and external entities in business information system.
Overview of Data Flow Diagram

Creating Data Flow Diagram

  1. To create a Data Flow Diagram, right-click on the Data Flow Diagram node from the Diagram Navigator and select New Data Flow Diagram from the popup menu.
    Creating Data Flow Diagram from Diagram Navigator

  2. Alternatively, click on the New Data Flow Diagram button on the toolbar.
    Creating Data Flow Diagram from toolbar

Drawing Data Flow Diagram

Process

Process notation

  • To create a Process, click once on the Process button on the palette and then click on the diagram.
    Creating Process from palette

  • To provide the Process a name, double-click on it and enter the name.
    Input name for Process

  • To specify the location of the process, right-click on the Process and select Open Specification... from the popup menu. In the Process Specification, enter the Location.
    Process Specification

  • You can also enter an ID for the process
    Enter ID in Process Specification

  • Click OK to confirm the change. You will see the Process shape is updated to show the location and ID.
    Process notation after entered an ID

External Entity

External Entity notation

  • To create an External Entity, click once on the External Entity button on the palette and then click on the diagram.
    Creating External Entity from palette

  • To provide the External Entity a name, double-click on it and enter the name.
    Input name for External Entity

Data Store

Data Store notation

  • To create a Data Source, click once on the Data Source button on the palette and then click on the diagram.
    Creating Data Store from palette

  • To provide the Data Source a name, double-click on it and enter the name.
    Input name for Data Source

  • By default, the type of the Data Store is Computerized data. There are several other types such as Manual, Transient data file and Transient manual. To set the type, right-click on the Data Store and select Open Specification... from the popup menu. In the Data Store Specification, select the Type from the drop-down menu.
    Select Type in Data Store Specification

  • Click OK to confirm the change. The selection of type will affects the appearance of the Data Store shape. The result of selecting different types are shown below:
    Different types of Data Store

Data Flow

Data Flow notation

  • To create a Data Flow, click once on the Data Flow button on the palette and then click and drag from the source element to the target element.

    Creating Data Flow from palette

Downloads

Resources

 
 
Last modified: 2007/02/26 11:11
 
 
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