Data flow diagram is a well known approach to visualize the data processing in business analysis field. A data flow diagram is strong in illustrating the relationship of processes, data stores and external entities in business information system.
Data flow diagram is a well known approach to visualize the data processing in business analysis field. A data flow diagram is strong in illustrating the relationship of processes, data stores and external entities in business information system.
Process
Definition
A process takes data as input, execute some steps and produce data as output.
Properties
Name
The name of process.
ID
Used to uniquely identify DFD elements.
Location
A physical location of the staff responsible to the process.
Documentation
Used to annotate the process, such as descriptions and other documentation.
External Entity
Definition
Objects outside the system being modeled, and interact with processes in system.
Properties
Name
The name of external entity.
ID
Used to uniquely identify DFD elements.
Documentation
Used to annotate the external entity, such as descriptions and other documentation.
Data Store
Definition
Files or storage of data that store data input and output from process.
Properties
Name
The name of data store.
ID
Used to uniquely identify DFD elements.
Type
The type of data.
Documentation
Used to annotate the data store, such as descriptions and other documentation.
Data Flow
Definition
The flow of data from process to process.
Properties
Name
The name of data flow.
ID
Used to uniquely identify DFD elements.
Documentation
Used to annotate the data flow, such as descriptions and other documentation.
Bidirectional
Determines whether the flow of data is in both or single direction.
Bidirectional Data Flow
Definition
The flow of data that flow both from and to process.
Properties
Name
The name of data flow.
From
The source of flow.
To
The target of flow.
Documentation
Used to annotate the data flow, such as descriptions and other documentation.
Bidirectional
Determines whether the flow of data is in both or single direction.
