Here you can use different options

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For myself, I came up with the following formulation: DFD is a notation designed for modeling information systems in terms of data storage, processing and transmission. Why do we need DFD notation? Historically, the syntax of this notation is used in two variants - Yourdon and Gane-Sarson. The differences between them are in the table below: I personally use only one of the options, according to Hein and Sarson. But when I was studying the material before writing this article, I saw this comparison table. I think it is important not so much for choosing a syntax option, which will depend more on the choice of software for creating notations and your personal preferences, but as a visual illustration of the fact that DFD does not have a strict syntax, like, for example, in BPMN.

The main thing is that they are understandable list of netherlands whatsapp phone numbers to you and your clients. DFD notations are a convenient tool for creating ad hoc diagrams that can be done quickly and with maximum freedom. This type of notation is used when a description of the system as a data storage is required. That is, the notation should clearly answer the questions: What does an information system consist of? What is needed to process information? The DFD notation itself consists of the following elements: Process , i.e. a function or sequence of actions that must be taken to process data.

This could be creating an order, registering a client, etc. It is common to use verbs in process names, i.e. "Create a client" (not "create a client") or "process an order" (not "place an order"). There is no strict system of requirements here, as, for example, in IDEF0 or BPMN, where notations have a strictly defined syntax, since they can be executable. But it is still worth following certain rules in order not to cause confusion when other people read the DFD. External Entities. These are any objects that are not part of the system itself, but are a source of information for it or recipients of any information from the system after data processing.