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A system diagram is known as a first level DFD (Level 0 DFD) A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system.
Flow Chart is a generic term, and DFD is a specific one. Data Flow Diagram (DFD) is a data flow chart to illustrate the data flow/store/change in a component/system/product from the input to the output.
Advantages of data flow diagram:· A simple graphical technique which is easy to understand.· It helps in defining the boundaries of the system.· It is useful for communicating current system knowledge to the users.· It is used as the part of system documentation file.· It explains the logic behind the data flow within the system.Disadvantages of data flow diagram:· Data flow diagram undergoes lot of alteration before going to users, so makes the process little slow.· Physical consideration are left out.· It make the programmers little confusing towards the system.· Different DFD models have different symbols like in Gane and Sarson process is represented as rectangle where as in DeMarco and Yourdan symbol it is represented as eclipse.
A partial circle is an arc
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Data Flow Diagram or DFD is made to give an idea as to how a particular process will flow.
data flow diagram for creating a insurance policy
data flow diagram for atm(automated teller machine)
data flow diagram for voice recognition
credit card flow diagram
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Sankey diagram
It is a type of flow chart
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 for creating new browser