Steve Skidmore
Abstract
This chapter returns to the process model of the system — the Data Flow Diagram. It shows how the current physical DFD can be converted into its logical equivalent — the current logical Data Flow Diagram. This is then amended and extended to reflect the requirements of the replacement system — the required logical Data Flow Diagram.
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This chapter returns to the process model of the system — the Data Flow Diagram. It shows how the current physical DFD can be converted into its logical equivalent — the current logical Data Flow Diagram. This is then amended and extended to reflect the requirements of the replacement system — the required logical Data Flow Diagram.
Key concepts: Data flow diagram, Logical data model, Diagram, Logical conjunction, Process (computing), Perspective (graphical), Computer science, Flow (mathematics)