DFD Examples

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DFD Examples
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DFD Notation

• Data Flow labeled arrow
• Sources and sinks of information/data (also
  called external entity)

• Process

or

• Available data (data store)

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Example Air line reservation
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DFD Example 1 Payroll
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DFD Example 2 Old Car Mart

• Buys and sells old cars has large number in
  stock different models, make, year,colors,
• Does some repairs for adding value records kept
  has own garage
• Advertise in news papers
• Salesmen hired on commission basis to handle
  customers, negotiate, etc.
• Needs to take stocks prepare summary of sales,
  profits, etc pay salesmen
• Prepare DFD

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Example 3 Book Supplier

• Supplies books to customers no stocks
  maintained books sourced directly from
  publishers
• Prepare context diagrams

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Book Supplier Exploding Process 2