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DFD Examples

DFD Examples. or. or. DFD Notation. Data Flow : labeled arrow Sources and sinks of information/data (also called external entity). Process. or. Available data (data store). Example: Air line reservation. DFD Example 1: Payroll. DFD Example 2: Old Car Mart.

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DFD Examples

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  1. DFD Examples

  2. or or DFD Notation • Data Flow : labeled arrow • Sources and sinks of information/data (also called external entity) • Process or • Available data (data store)

  3. Example: Air line reservation

  4. DFD Example 1: Payroll

  5. 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

  6. Example 3: Book Supplier • Supplies books to customers; no stocks maintained; books sourced directly from publishers • Prepare context diagrams

  7. Book Supplier: Exploding Process 2

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