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).
Questions tagged [data-flow-diagram]
22 questions
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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 previous data like:
(if user.isMarried &&…
5
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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, a swim lane diagram or some other?
Vikash Kodati
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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 mentioning this because my text books refer to…
Ahmed Mohamed
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2 answers
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 items, customers etc., the admin should go through…
RalpawTato
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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 together with a line (process, entity, data store) but does…
Howdy_McGee
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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 "Teacher" are seperate external entities, "View leaderboard"…
Ice
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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 have read that it should read left to right. Does…
PlantPot
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Could conditions be used with Data Flow Diagrams?
I'm trying to make a DFD for this scenario:
after admission, the patient gets the service he needs.
I've been trying to do it using this diagram (there are 3 available services):
but I don't think it's going to work like this, maybe there is a way…
Ahmad Ahmad
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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 is the context diagram then the second level is…
AAAA
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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 event flow moves from top to bottom, going back and…
JamesHoux
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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 this question, I’m interested to show the activity…
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Are there still advantages of the data-flow diagram in a world of SysML and UML?
I recall some criticizing structured analysis as something outdated, but it seems that it is still in use today at least with DFDs. A company who claims to be agile in its ways was using a tool called PyTM for threat modeling for example, and that…
Passeris
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A Case Study Dataflow Diagram
From the book Essentials of Systems Analysis and Design by Joseph S. Valacich, Joey F. George, Jeffrey A. Hoffer, we have a study case, with the following 0 DFD :
This diagram raises the following question:
Why do we have the data flow Product…
AAA
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Data Flow in Data Flow Diagram
Consider the following level - 0 dataflow diagram for a patient management system :
Consider the doctor entity, the system provides an appointment report to the doctor. If the system only generates the report upon a request from the doctor, do I…
AAA
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What does it mean the fish objects on the architecture diagram?
What does it mean this fish object on the architecture diagram?
J.J. Beam
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