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Explain context and data flow diagram with an example

Explain context and data flow diagram with an example

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Context Diagram: In the context diagram, instead of representing all the processes of the system, the only main process is represented so that people can get the context of the system.

3 symbols are used in context diagram.

Circle: To represent a single process. There can be only one procss i.e one circle in the context diagram

Arrow: to represent data flow

Rectangle: to represent an external entity affecting the process

Data flow Diagram:  In any system, the data flow of the system is represented by the data flow diagram.

It has two parts: Logical, Physical.

Logical: It shows the flow of data through a system to perform the functionality of the system

Physical: It describes the structure of logical data flow

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