Data Flow Diagram [PPT]
|Name: Data Flow Diagram PPT Material
File Type: Presentation Slide(PPT)
A data flow diagram (DFD) is a graphical representation of the “flow” of data through an information system. DFDs can also be used for the visualization of data processing (structured design).
On a DFD, data items flow from an external data source or an internal data store to an internal data store or an external data sink, via an internal process.
On the context diagram (also known as the ‘Level 0 DFD‘) the system’s interactions with the outside world are modelled purely in terms of data flows across the system boundary. The context diagram shows the entire system as a single process, and gives no clues as to its internal organization.
This context-level DFD is next “exploded”, to produce a Level 1 DFD that shows some of the detail of the system being modeled. The Level 1 DFD shows how the system is divided into sub-systems (processes), each of which deals with one or more of the data flows to or from an external agent, and which together provide all of the functionality of the system as a whole. It also identifies internal data stores that must be present in order for the system to do its job, and shows the flow of data between the various parts of the system…..
Get more information about overview about DFD on Data Flow Diagram PowerPoint.
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