Data Flow Diagram info

Link explanations of DFDs.

http://agilemodeling.com/artifacts/dataFlowDiagram.htm

Online creation tools:
https://www.smartdraw.com/data-flow-diagram/
https://www.lucidchart.com/pages/data-flow-diagram/data-flow-diagram-symbols#discovery__top

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https://en.wikipedia.org/wiki/Data-flow_diagram

… and in Visio.
https://support.office.com/en-us/article/create-a-gane-sarson-data-flow-model-diagram-0d7ca68a-0cd2-4022-8cc9-4003bbae3724

Gane-Sarson vs Yourdon
https://www.chegg.com/homework-help/explain-differences-gane-sarson-yourdon-symbols-provide-exam-chapter-5-problem-2q-solution-9781285633190-exc

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