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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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