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A Data Flow Diagram (DFD) is a technique that shows the flow of data among processes, data stores, and external entities in a system. DFDs can be categorized as logical or physical, depending on the level of detail and abstraction. A logical DFD focuses on the business functions and data flows, without specifying the implementation details. A physical DFD shows the actual componentsand mechanisms that are involved in the data flow, such as hardware, software, files, and network connections. References: *10.13 Data Flow Diagrams | IIBA® - International Institute of Business ..., menu, 10.13 Data Flow Diagrams *Business Analysis Certification in Data Analytics, CBDA | IIBA®, CBDA Competencies, Domain 2: Source Data *Introduction to Business Data Analytics: Organizational View, page 16, Figure 6: Data Flow Diagram
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