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"Data flow diagrams are one of the three essential perspectives of the structured-systems analysis and design method SSADM. The sponsor of a project and the end users will need to be briefed and consulted throughout all stages of a system's evolution. With a data flow diagram, users are able to visualize how the system will operate, what the system will accomplish, and how the system will be implemented. The old system's dataflow diagrams can be drawn up and compared with the new system's data flow diagrams to draw comparisons to implement a more efficient system. Data flow diagrams can be used to provide the end user with a physical idea of where the data they input ultimately has an effect upon the structure of the whole system from order to dispatch to report. How any system is developed can be determined through a data flow diagram model.
In the course of developing a set of levelled data flow diagrams the analyst/ designers is forced to address how the system may be decomposed into component sub-systems, and to identify the transaction data in the data model.
Data flow diagrams can be used in both Analysis and Design phase of the SDLC.
There are different notations to draw data flow diagrams (Yourdon & Coad and Gane & Sarson), defining different visual representations for processes, data stores, data flow, and external entities." [Data flow diagram. Wikipedia]
The DFD (Yourdon and Coad notation) example "Process of account receivable" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Data Flow Diagrams solution from the Software Development area of ConceptDraw Solution Park.
Data Flow Diagram
Data Flow Diagram, process, external interactor, data store,
Used Solutions
The vector stencils library "DFD, Yourdon and Coad notation" contains 22 DFD elements.
Use it for drawing data flow diagrams (DFD) using Yourdon/ DeMarco notation in the ConceptDraw PRO diagramming and vector drawing software extended with the Data Flow Diagrams solution from the Software Development area of ConceptDraw Solution Park.
Class and object
Class and object, class and object,
Class
Class, class,
Object state
Object state, object state,
Generalization and specialization structure
Generalization and specialization structure,
Whole-part structure
Whole-part structure,
Condition
Condition, condition,
Loop
Loop, loop,
External interactor
External interactor, external interactor,
Data process
Data process, data process,
Multiple process
Multiple process, multiple process,
State
State, state,
Multi-state
Multi-state, multi-state,
Stop state
Stop state, stop state,
Stop state2
Stop state2, stop state,
Process
Process, process,
Process (offset)
Process (offset), process,
Center to center
Center to center,
Center to center #2
Center to center #2,
Loop on center
Loop on center,
Data store
Data store,
Instance
Instance,
Message
Message,
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