Users identify entities using the terms “terminators,” “sources,” “links,” and “actors. It stores all of the data inputs and secures them until later use.Įxternal Entity: External entities are the source and target of the system’s information and interact with it. In addition, a labeled arrow is used to indicate the flow of data.ĭata Store : The data store is the project’s database or backbone. It depicts the connection between the other components. Data Flow Diagram Symbolsĭata Flow : The data that flows between external entities, processes, and data stores is known as data flow. The following symbols show the presence of the payroll management system data flow diagram (DFD) levels. A data flow diagram (DFD) shows how data moves through the payroll system with the help of inputs and outputs.
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