Introduction to Data Flow Diagram
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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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