The context level data flow diagram is a physical input to the lower CASE models that automatically produce program code.

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The context level data flow diagram is not a physical input to lower CASE models that automatically produce program code. It is a high-level diagram that shows the system's inputs, outputs, and processes at a high-level of abstraction. The lower-level diagrams and models (such as the detailed data flow diagram and entity-relationship diagram) are used for analysis and design, and may be inputs to CASE tools that generate program code.

The Context Level Data Flow Diagram Is a Physical Input