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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 notation

or

or

DFD Notation

  • Data Flow : labeled arrow

  • Sources and sinks of information/data (also called external entity)

  • Process

or

  • Available data (data store)




Dfd example 2 old car mart
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


Example 3 book supplier
Example 3: Book Supplier

  • Supplies books to customers; no stocks maintained; books sourced directly from publishers

  • Prepare context diagrams



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