Identify the basic purpose of DFD and identify the steps of-02418
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vu mth718 Topics in Numerical Methods.
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vu mth718 Mid Term Solved Past Paper No. 14.
Question 1: Identify the basic purpose of DFD and identify the steps of designing a DFD for any process?
Answer:
Data Flow Diagram
"A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system."
The purpose of data flow diagrams is to provide a linking bridge between users and systems developers.
STEPS TO DRAW A DATA FLOW DIAGRAM
- Start from the context diagram. Identify the parent process and the external entities with their net inputs and outputs.
- Place the external entities on the diagram. Draw the boundary.
- Identify the data flows needed to generate the net inputs and outputs to the external entities.
- Identify the business processes to perform the work needed to generate the input and output data flows.
- Connect the data flows from the external entities to the processes.
- Identify the data stores.
- Connect the processes and data stores with data flows.
- Apply the Process Model Paradigm to verify that the diagram addresses the processing needs of all external entities.
- Apply the External Control Paradigm to further validate that the flows to the external entities are correct.
