Data flow diagram with login

Question

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 the login process in the data flow diagram first. But how can I illustrate that?

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Below is an image of what I have tried. I only included the add item function here. I am not entirely sure if it is correct. I am confused by how the item details should change, because as I have read, the process changes the data that is flowing through it. Anyway this is for another question.

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Answer 1

You need seperate "admin logged out" and "admin logged in" states. The "admin logged in state" should connect to "add item" and to each of the administrator actions. Logging out should return to the "admin logged out" state.

Answer 2

A data-flow diagram is a way of representing a flow of data through a process or a system.This diagram only show how your data is transmitted to the system it doesn't show any activity so that it required login to see all the functionality . and your diagram exactly do that.If you want to enhanced your diagram then You can separate your authentication into sign in and sign out.

For more Reference see below link:

https://www.visual-paradigm.com/guide/data-flow-diagram/what-is-data-flow-diagram/