Q. Draw a Context as well as Level 0 Data Flow Diagram (DFD) of any DVD rental System.
Context Diagrams at the Project Level
It illustrates the business system, not the computer system. It shows the input and output data flows to a central process that represents the business system under analysis. The context diagram defines the scope of the project.
Project Scope
A Context Diagram confines project scope to an agreed limit by obtaining agreement from the customer on the data flows that are included in the scope of a project. The Context Diagram focuses on relationships with external entities and identifies the information that is exchanged between these external entities and the business system under review. The external entities themselves are outside the scope of the project but the data flows between the entities and the business system are within the project scope.
Level of Detail
The Context Diagram at the project level is the root of the Functional Decomposition at the conceptual level of detail. The Context Diagram is level zero of the decomposition.
Project Scope
A Context Diagram confines project scope to an agreed limit by obtaining agreement from the customer on the data flows that are included in the scope of a project. The Context Diagram focuses on relationships with external entities and identifies the information that is exchanged between these external entities and the business system under review. The external entities themselves are outside the scope of the project but the data flows between the entities and the business system are within the project scope.
Level of Detail
The Context Diagram at the project level is the root of the Functional Decomposition at the conceptual level of detail. The Context Diagram is level zero of the decomposition.
DVD Rental System - 0 DFD
Context Diagram
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