dataflow diagram

dataflow diagram

A description of data and the manual and machine processing performed on the data as it moves and changes from one stage to the next. A dataflow diagram also includes the locations where the data are placed in permanent storage (SSD, disk, tape, etc.). See dataflow programming.
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For example, students learn how an entity-relationship diagram relates to a dataflow diagram, and how a dataflow diagram can be mapped to a process flow chart.
3.3.1 Dataflow Diagrams. A dataflow diagram (DFD) is a labeled directed hypergraph in which the nodes represent functions and the edges dataflows between functions.
All versions of dataflow modeling since DeMarco [1978] use hierarchical DFDs to reduce the complexity of a large dataflow diagram. Any part of a large diagram can be abstracted away by replacing it by a process group, which has the same visual presentation as a data process (an unbroken circle).
In other words, in structured analysis, a context diagram is a dataflow diagram. Large context diagrams may be split into a number of partial context diagrams, one for each major system function.
Similarly, a dataflow diagram syntax fits a functional computational model and not a production system, while graphical re-write rules fit production systems and not functional computation.
These languages resemble flow charts, dataflow diagrams, and graphical rewrite rules.
Next, this preliminary design is restated as a dataflow diagram with transforms.
In this analysis, programs are blueprinted as dataflow diagrams or bubble charts where the transforms-bubbles are connected by arrows which represent data that is output by one transform and input by another.
"We then analyze the data offsite and prepare up-to-date network diagrams, dataflow diagrams, zone and conduit diagrams, and a vulnerability register," Cusimano says.
At the low end of the social context spectrum are the largely objective tools that have emerged from traditional systems analysis including flowcharts and dataflow diagrams [Gane and Sarson 1979], the IDEF suite of process maps [Mayer et al.
Further, it does not address life cycle phases beyond dataflow diagrams and process specifications.
The idea of specifying data flow between entities is taken from the Object Dataflow Diagrams of Stark and Seidewitz.