Gane and Sarson notation and Yourdon and Coad notation.
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Data Flow Diagram or DFD is made to give an idea as to how a particular process will flow.
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.
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"Draw Data flow diagram of car dealer?"
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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