Component of DFD
Data Flow Diagram is re-present about System or a Sub System Process along with
Data Flow, Data Storage and External Entity components. Context Diagram can design
with any appropriate Notation and the Data Flow Diagram should design with following
Pictograms. In practice, the Process, Data Flow, Data Store and External Entity
should transform into Application Code, Screen, Data File and Application End User.
01. The Process Component should transform into Application Code with Input Data
Validation, Application Function and Application Procedure to Manage Business Process
Information.
02. The External Entity Data Flow Component should transform into Application Screen,
possibly, Window Form or Web Page to get Input Information from Application End
User.
03. The Process Data Flow Component should transform into Application SQL Statement
to Insert, Update and Delete Business Information in the Data File or Selection
Information from Data File.
04. The Data Storage Component should transform into Data Flat File or Database
to Store and Maintain Business Information.
05. The External Entity Component is Operating a Business or Application.
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