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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How to represent a duplicate data store in a data flow diagram (DFD) in the Yourdon DeMarco notation?

I am looking for a way to show duplicate data-stores in data-flow diagrams (DFD). With "duplicate" I mean multiple occurrences of the same symbol to avoid too many crossing flows. In Gane &...
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In a Data Flow Diagram, can 2 entities use the same process (with the same incoming data flow)?

For a school project, I need to make a DFD for an educational game, where both students and teachers need to be able to view the game's leaderboard. Currently in my diagram, "Student" and &...
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Do data stores appears in Level 1 DFD?

Let’s consider that Context diagram is the diagram that describe the system as a single process and level 0 diagram is the one that decomposes this main process into major process and so on. I am ...
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Draw Data Flow Graph with Constructor and Functions

I am new to software testing and would like to know whether it's appropriate to draw a data flow graph that flows from initiation of variables to constructor and method. Is there something wrong with ...
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Data Flow Diagram for patient information system for a hospital

I have an example for a DFD for a patient information system implemented in a certain hospital. The below figure, represents the overview diagram (level 0-diagram, if we consider that the first level ...
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What kind of diagram is this?

I was given an API document that contained this diagram. And I was amazed at how cleanly it presents the flow of data between multiple endpoints by putting the end points in vertical silos. Data ...
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Refining DFD of an RPG

I am making a game to help childern learn Urdu (Urdu Boli = Urdu Language) This is the high level context diagram of the game.Considering an RPG can any additions be made to the diagram?
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Drawing UML activity diagram for Statistics feature

I need to draw a UML Activity diagram for a school java software engineering project I’m required to do. I’m quite new to this and I’m not sure what should be shown and what should not be shown. For ...
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Diagram to show how one object "becomes" another?

I am working in a purchasing system where we take calls: public class Call { public List<CallItem> CallItems { get; set; } } The calls can be turned into quotes, where call items become ...
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Avoiding crossing lines in DFD diagrams

I have researched DFDs reasonably extensively, and received some feedback from peers about my first DFD. I have since reworked it to avoid lines crossing by duplicating the 'Pokemon' data store. I ...
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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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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 structure/algorithm for conditional next step

I have been trying to find a proper way to represent the above data flow (this is just a small case), and I'm not sure if I found a good way to do it. Our current implementation just evaluate all the ...
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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 managed ...
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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 ...
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