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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.
A Sankey diagram is a flow visualization tool that represents the flow of resources or information between different entities or stages in a process. The width of the arrows or lines in the diagram is proportional to the quantity or volume of flow, making it easy to see where resources are being allocated or lost. Typically, the diagram has inputs on one side and outputs on the other, illustrating the relationships and flow direction between various components. This visual format helps to identify inefficiencies or areas for improvement in a 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.
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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 atm(automated teller machine)
credit card flow diagram
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data flow diagram for creating a insurance policy
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.
"Draw Data flow diagram of car dealer?"