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Definition: Context Level Data Flow Diagram
Proposed by Larry Constantine, data flow diagram suggests the flow of data through in an information system. It focuses on the process aspects and doesn’t provide ant information related to the sequence or timing of the processes.
A Data Flow Diagram shows what information is sent as an input and what information comes as an output and where the next information will go. It is a best practice to draw the context level data flow diagram of any system first which provides information on system’s interactions with the external environment and boundaries of system in terms of data flow. It provides useful information about the system boundaries, external entities involved and level of interaction and information flow between external entities and system in place. It is also known as level 0 flow diagrams. A level 1 diagram shows and explains the main processes in the system.
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