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  Data Flow Diagram

Introduction to Data Flow Diagram

A perfect image can help to understand a topic more clearly

Diagram must help to understand the object behind the working of software. A properly defined flow model diagram, not only helps to understand the working of the model, but also helps the software designer to built it and test it for validation with ease.

A data flow diagram is a graphical representation that depicts the information flow and the transforms that are applied as data moves form input to output. It can be sued to represent software at any level of abstraction. In fact DFD may be partitioned into levels that represent increasing information flow and functional detail. Therefore, it provides mechanism for functional modelling as well as information flow modelling.

DFD models a system using  external entities (or events)  which  defines  the  types and  amount of data  that flows  to  a process, which  transforms it and then  creates an  output which then flows  to some other process or external  entities as output flow. Data may even flow from or to some secondary storage (generally described as data dictionary.) the graphical representation makes it a good toll for communication between designer and analyst.

DFD are defined in levels, with every level decreasing the level of abstraction, as well as defining greater details of the functional organs of the system. A o level DFD also known as  context fundamental system model, represents  the entire software elements as a single bubble, with  input and output data entities which  are indicates as incoming and outgoing arrows.

Additional processes and information flow  path are represent as separate bubble as o level DFD  is partitioned into level 1 which is then  partitioned into level 2 and so on.

The levels are partitioned till a crystal clear view of the system is achieved.

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