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Questions tagged [data-flow-diagram]

A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system, modeling its process aspects. DFDs can also be used for the visualization of data processing (structured design).

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Is there such thing as an internal entity in DFD?

According to my teacher, A CONTEXT diagram NEVER shows what goes on INSIDE a system! It only shows the EXTERNAL entities and the circle is the SYSTEM BOUNDARY. ie the boundary between what is ...
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Combined Entities in Context Diagrams

Below are interactions of a Sales team and Development Team with an Admin app. They both have the same data flows in and out. If, the diagram gets too crowded, is it viable to create a combined entity,...
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How to show data flow between entities in a data flow diagram when input data and output data is the same?

For example : Customer --->(customer details) SEND DETAILS --->(customer details) --->Clerk
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What is a good diagrammatic way to represent async event communication between two systems?

What is a good diagrammatic way to represent asynchronous event communication between two systems (the pub sub model)? I am not looking for tools but more of a representation. Is it a sequence diagram,...
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Data flow diagram with login

I am creating a system that allows an admin to login, manage items, customers, reservations and many more. But as i have asked my professor, he told me that before the admin can access the manage ...
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Do context diagrams have levels?

I heard that the context analysis diagram has different levels. I couldn't find this in .Net, but I have seen that a DFD has different levels. Do context diagrams have any levels (level0, level1, ...
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Data Flow Diagrams - Difference between Lines and Arrows

I'm currently working with Visio to create Data Flow Diagrams for a System Analysis and Design class but I'm unsure what the difference between ------ and ------> is. I can connect 2 shapes ...