Soft Exam System Architect Concise Tutorial | Case Analysis | Requirement Analysis

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Data Flow Diagram

Data Flow Diagram (DFD), from the perspective of data transmission and processing, uses graphical symbols to describe the function of each component in the system and the transmission of data between them by using graphical symbols to illustrate the system.completed function.

Elements of a data flow diagram

DFD includes: Data Streaming, Processing, Data Storage (Files), External Entities.

element	Description	Legend
Data flow	Consists of a fixed set of data&#