Logical vs Physical DFD

Logical DFD

  • It depicts how the business operates.
  • The processes represent the business activities.
  • The data stores represent the collection of data.
  • It s how business controls.

Physical DFD

  • It depicts how the system will be implemented.
  • The processes represent the programs, program modules, and manual procedures.
  • The data stores represent the physical files and databases, manual files.
  • It show controls for validating input data, for obtaining a record.
  • Used for system security.