Case If Kismet is considered, as described in Section 12.2, it can be seen that one very general…

Case If Kismet is considered, as described in Section 12.2, it can be seen that one very general course of action is taken. Orders from customers are processed to generate dispatch notes (which eventually accompany goods sent to the customer) and to make up invoices (sent to the customer and to the accounts department). In doing this, a price catalogue and customer account details are consulted and inventory records are updated. This is indicated in Figure 12.6. In itself it is not very informative, although, even at this level, in a more comprehensive analysis of all Kismet’s functions there would be other interfacing subsystems, such as purchasing, payroll and accounting. If the analyst had seriously misunderstood the structure of the system, this would be obvious at a glance. Further progress can be made by decomposing this order-processing function into its component parts. Three different types of task occur when Kismet processes a customer order. First, the company order is generated and approved. Second, stock is selected, inventory updated and a dispatch note prepared. Finally, invoices are made up and sent to the customer and to accounts. Involved in this are various data flows, stores, processes, sources and sinks. Read the case study and note where the sources, sinks, processes, stores and flows occur. These are:

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