Gane and Sarson notation and Yourdon and Coad notation.
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The purpose of a data flow diagram is to show you how the data flows through an information system. A sequence diagram shows you information regarding how the processes work together and in what order they operate.
Data Flow Diagram or DFD is made to give an idea as to how a particular process will flow.
A data flow diagram illustrates how data flows from logical point to point in a system. Examples of nodes in such a diagram are databases, tables, discs, servers, clients, etc.. A control flow diagram illustrates how different programs, applications, services, or endpoints act on and process information to achieve certain ends within the context of a system.
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