The manager checks and enters the received data into the system

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A warehouse worker creates documents, such as an invoice, and ships the goods. The client receives the goods and a package of documents for them. We need to see this sequence of actions from the point of view of storing data and working with it in the IT system. From a DFD perspective we have: The buyer is an external entity that is the source of data and the recipient of the result. The process of order processing (confirmation and posting of data in the system by the manager). Collecting the order at the warehouse (after receiving the application).

Registration of shipment (creation of necessary list of namibia whatsapp phone numbers documents). What rules do you need to know to create a DFD diagram: Each process must have one input and one output. The purpose of processes here is to process data, so a process must receive data (incoming arrow) and give it somewhere after processing (outgoing arrow); The data processing process must have an external input arrow (data from an external entity). In order for any such process to start working, it is not enough to use data from the storage, new information must arrive for further processing; Arrows cannot directly connect data warehouses, all connections go through processes. There is no point in simply moving data from one place to another, and this is how a direct connection between two warehouses is read by an arrow.

Data comes in so that some actions are performed, in our example - the sales process is carried out. And this is possible only through processing (process); All processes must be linked either to other processes or to other data stores. Processes do not exist on their own, and therefore the result must be transferred somewhere; Decomposition. DFD diagrams provide the ability to create large processes and decompose them into subprocesses with a detailed description of actions. For example, we can create a process "creating an application", which can then be decomposed into a sequence of actions, for example, to receive an application, separately - checking and receiving customer data, if the goods in the online store are sold to order, then when forming an application, it will also be necessary to receive data from the supplier on the availability of the required items, etc.