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How to converting a current physical DFD into a logical DFD.

  • Replace physical data stores with main logical data stores.
  • Remove transient data stores.
  • Remove processing that cannot be automated.
  • Remove processes that simply reorganize data.
  • Combine processes joined by data flows.
  • Combine processes performing the same function.
  • Minimize data flow content.
  • Obtain data only when needed.
  • Use meaningful names.
  • Remove all references to physical location.
  • Remove processes that do not alter data.