A special form of data-flow plan is a site-oriented data-flow plan.ĭata-flow diagrams can be regarded as inverted Petri nets, because places in such networks correspond to the semantics of data memories. When using UML, the activity diagram typically takes over the role of the data-flow diagram. The data-flow diagram is a tool that is part of structured analysis and data modeling. The refined representation of a process can be done in another data-flow diagram, which subdivides this process into sub-processes. The notation presented above was described in 1979 by Tom DeMarco as part of structured analysis.įor each data flow, at least one of the endpoints (source and / or destination) must exist in a process. There are several notations for displaying data-flow diagrams. Specific operations based on the data can be represented by a flowchart. A data-flow diagram has no control flow - there are no decision rules and no loops. The DFD also provides information about the outputs and inputs of each entity and the process itself. Data flow diagram with data storage, data flows, function and interfaceĪ data-flow diagram is a way of representing a flow of data through a process or a system (usually an information system).
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