Physical DFDs :

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• Physical DFDs
• Extension of Logical DFD to include the physical
  design of system.
• How logical processes are physically implemented
• What technology / person performs a process
• logical process spit into multiple
  physical processes
• different technologies
• different implementations of the same logical
  processes
• e.g Phone Orders, Paper Form orders
• Audit / Control processes , handling exceptions
• e.g CREDIT MANAGER MAKE CREDIT DECIISIONS
• MAKE CREDIT DECISION ( CREDIT MANAGER )

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• Physical Process
• e.g Enter Transaction (Logical)
• Scan member bar code ( Physical )
• e.g. SAP Process Order
• Physical Data Stores
• master file, temporary file, audit file
• Physical Data Flows
• e.g Payment (Logical )
• Cash, check or credit card (Physical )
• actual data record or field names
• data carrier e.g Order form 4
• Tape bar Code
• Rental Order Receipt

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• Partitioning a physical DFD into programs
• processes performed at different times or by
  different users
• batch versus real time
• Automation Boundaries

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