Data Flow Diagram - IT Project Management

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A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system. Get the detailed dataflow diagram tutorial about the symbols with the example.

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Data Flow Diagram - IT Project Management

  1. 1. Welingkar’s Distance Learning Division I.T. for Management CHAPTER-8 Determining Information Need Data Flow Methods We Learn – A Continuous Learning Forum
  2. 2. Welingkar’s Distance Learning Division Determining Information Need Data Flow Methods What is a Data Flow Diagram (DFD)? • A Design tool • A graph of data flow • Also known as • Bubble chart • Data Flow Graph We Learn – A Continuous Learning Forum
  3. 3. Welingkar’s Distance Learning Division Determining Information Need Data Flow Methods What is a DFD used for ? To show: • Data flow in a system • Source and destination of data • Processes that manipulate the data We Learn – A Continuous Learning Forum
  4. 4. Welingkar’s Distance Learning Division Determining Information Need Data Flow Methods Components of a DFD • External entity • Process We Learn – A Continuous Learning Forum
  5. 5. Welingkar’s Distance Learning Division Determining Information Need Data Flow Methods Components of a DFD • Data flow • Data store We Learn – A Continuous Learning Forum
  6. 6. Welingkar’s Distance Learning Division Determining Information Need Data Flow Methods How to model with DFD's ––Step 1 Identify and label components of the DFD Bank account Requirements Customer request We Learn – A Continuous Learning Forum Customer PROCESS REQUEST
  7. 7. Welingkar’s Distance Learning Division Determining Information Need Data Flow Methods How to model with DFD’s –Step 2 Construct the Context level (Level 0) • An overview of the system • Show external entities REQUEST Processed REQUEST We Learn – A Continuous Learning Forum CUSTOMER BANK SYSTEM ATM OUTLET
  8. 8. Welingkar’s Distance Learning Division Determining Information Need Data Flow Methods How to model with DFD’s –Step 2 Level 2 Level 0 We Learn – A Continuous Learning Forum 1 P 2 P2 P1 P3
  9. 9. Welingkar’s Distance Learning Division Determining Information Need Data Flow Methods How to model with DFD’s –Step 3 Construct more lower levels of the DFD - Divide processes into sub-processes - Divide until each process has one action - Number the levels • Divide until one action per process • Use 3 -7 levels for flow model • Follow requirements We Learn – A Continuous Learning Forum
  10. 10. Welingkar’s Distance Learning Division Determining Information Need Data FlowMethods We Learn – A Continuous Learning Forum
  11. 11. Welingkar’s Distance Learning Division Determining Information Need Data Flow Methods End of Chapter 8 We Learn – A Continuous Learning Forum

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