![]() ![]() Optional: You can label the data flow "customer information" if you like. Use the Resource Catalog to create a data flow from Customer to Process Order. Meanwhile, the Process Order process also receives customer information from the database to process the order. Enter order information has the caption of flow.Select Data Flow from Resource Catalog.Drag out the Resource Catalog icon and release your mouse button on Process Order. Place your mouse pointer over Customer.For example, Customer provides order information when placing an order for processing. The remaining steps in this section are about connecting the model elements in the diagram. Wiring with connection lines for data flows That is the old spot for the System process and we place them there to elaborate System. Create three processes (Process Order, Ship Good, Issue Receipt) in the center as shown below.In the diagram's name box, enter Level 1 DFD and press ENTER. Right-click on its background and select Rename. Every element should remain unchanged, except that the System process (from which this new DFD decomposes) is now gone and replaced by a blank space (to be elaborated). Note: The new DFD should look very similar to the Context diagram initially. So when you are prompted to add them to the new diagram, click Yes to confirm. ![]() The data stores and/or external entities connected to the selected process ( System) would be referred to in the level 1 DFD. Right-click on System and select Decompose from the popup menu. Instead of creating another diagram from scratch, we will decompose the System process to form a new DFD.We have just completed the Context diagram. Create two more data stores, Customer and Transaction, as shown below.Use the Resource Catalog to create a Data Store from System, with bidirectional data flow in between. Now we'll model the database accessed by the system.Release the mouse button and select Bidirectional Data Flow -> External Entity from Resource Catalog.Press and drag out the Resource Catalog button at the top right. ![]() Next, let's create an external entity.From the Diagram Toolbar, drag Process onto the diagram. Enter Context as diagram name and click OK to confirm. ![]()
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