data flow diagrams

What is meant by Data Flow Diagram (DFD)?

• Graphical representation of data flow

• Company organization chart

• Data storage record

• Main database

What are the main components in a Data Flow Diagram?

• Process, data flow, data store, external entity

• Input, output, table, decision

• Text, diagram, image, chart

• Script, entity, form, database

What does the circle symbol in a DFD represent?

• Process

• External entity

• Data store

• Data flow

What is the function of an external entity in a DFD?

• Send or receive data from the system

• Store data in the system

• Generate system reports

• Make decision analysis

What symbol represents data flow in a DFD?

• Arrow

• Circle

• Rectangle

• Triangle

What is the data store symbol in a DFD?

• Two parallel lines

• Circle

• Rectangle

• Dashed arrow

What does a logical DFD focus on?

• What processes occur

• How data is stored

• Type of hardware

• Version number of the system

What does a physical DFD focus on?

• How the system is implemented

• Logical procedures of the system

• Security records

• Type of users

What is the meaning of context diagram in a DFD?

• Overview of the system

• Relationship between data stores

• Database diagram

• Organization chart

How many processes are in a context diagram?

• One

• Two

• Depends on the system

• No limit