BTEC - Digital Information Technology - Component 3 D

DFD stands for

• Data Flow Diagram

• Diagram for Data

• Data Following Definition

What are data flow diagrams used for? They are used to model...

• flow of data between a system and people, devices and organistions

• flow of data in a system

• flow of data between a user and a device

• flow of data between different organisations

Why do organisations use data flow diagrams?

• to help when designing a system

• to help when building a system

• to help when fixing a system

What are the 3 main parts of a level 0 DFD?

• The system, external entities, data flows

• The user, internal entities, data flows

• The system, internal entities, data flows

Which shape represents the system in a data flow diagram?

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Which shape represents external entities in a data flow diagram?

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Which shape represents the flow of data in a data flow diagram?

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Data flows must go to or from the system.

True or False?

• True

• False

Data flows cannot run between the external entities.

True or False

• True

• False

Flowcharts are used to define the steps in a process.

True or False

• True

• False