DFD Diagram

What do Data Flow Diagrams (DFDs) primarily illustrate?

• How data is stored in a database.

• The flow of information within a system, including inputs and outputs.

• The physical layout of a computer network.

• The organizational structure of a company.

Who were the authors of the classic text "Structured Design" that first described Data Flow Diagrams?

• Yourdon & Coad

• Gane & Sarson

• Larry Constantine & Ed Yourdon

• James Martin & Grady Booch

In Data Flow Diagrams, how are processes typically depicted in the Yourdon & Coad notation compared to the Gane & Sarson notation?

• Yourdon & Coad uses squares, while Gane & Sarson uses circles.

• Yourdon & Coad uses circles, while Gane & Sarson uses squares with rounded corners.

• Yourdon & Coad uses rectangles, while Gane & Sarson uses ovals.

• Yourdon & Coad uses diamonds, while Gane & Sarson uses hexagons.

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What is the main characteristic of a Context Diagram (Level 0) in a Data Flow Diagram?

• It shows detailed internal processes and data stores.

• It generalizes the function of the entire system in relation to external entities.

• It illustrates the physical components of the system.

• It focuses on the flow of data between different departments.