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Determine the level 0 and level 1 of DFD
External entities provide input data for processing. During processing, some intermediate data is generated. After final processing, final output data is produced. Data store is repository of data.
Structured approach of system design needs extensive modeling of the system. Hence instead of making a complete model exhibiting the functionality of system, DFD's are created in a layered manner. At first layer, DFD is made at block level and in lower layers, details are shown. Hence level "0" DFD makes a fundamental system (Figure).
DFD's can signify the system at any level of abstraction. DFD of '0' level views entire software element as a single bubble with indication of only output and input data. Hence, "0" level DFD is also termed as Context diagram.
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