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An external entity must be associated with at least a process.A data store must be associated with at least a process.Process labels should be verb phrases data stores are represented by nouns.The process forwards the Inventory order to the Supplier and stores the updated Inventory details in the Inventory data store. The Manager can also initiate the Order Inventory process by providing Inventory order. The Manager can receive Reports through the Generate Reports process, which takes Inventory details and Orders as input from the Inventory and Order data store respectively. The process also delivers a Bill to the Customer. The Order Food process receives the Order, forwards it to the Kitchen, store it in the Order data store, and store the updated Inventory details in the Inventory data store. The Food Order System Data Flow Diagram example contains three processes, four external entities, and two data stores.īased on the diagram, we know that a Customer can place an Order. Read through the diagram and then we will introduce some of the key concepts based on this diagram. break down) of the Food Ordering System process shown in the context DFD. The figure below shows the level 1 DFD, which is the decomposition (i.e. It contains one and only one process and does not show any data store. In between the process and the external entities, there is data flow (connectors) that indicate the existence of information exchange between the entities and the system.Ĭontext DFD is the entrance of a data flow model. In this example, the Supplier, Kitchen, Manager, and Customer are the entities who will interact with the system. It also shows the participants who will interact with the system, called the external entities.
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It contains a process (shape) that represents the system to model, in this case, the " Food Ordering System". The figure below shows a context Data Flow Diagram that is drawn for a Food Ordering System. Simple to draw, amend and elaborate as its limited notation.No technical knowledge is required to understand with the simple notation.Shows the overview of the boundaries of a system.Some of the benefits of a Context Diagram are: At this level, there is only one visible process node that represents the functions of a complete system in regards to how it interacts with external entities. The Food Ordering System Example Context DFDĪ context diagram is a data flow diagram that only shows the top level, otherwise known as Level 0.