![]() The Video Rental System Data Flow Diagram example contains three processes, two external entities and two data stores. ![]() Read through the diagram and then we will introduce some of the key concepts based on this diagram. break down) of the video rental system that is 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, which makes the diagram simple. In between the process and the external entities, there are data flow connectors indicating the existence of information exchange between customer and the system.Ĭontext DFD is the entrance of a data flow model. In this example, there are two external entities, namely Customer and Manager. It also shows the participants who will interact with the system, called the external entities. It contains a process (shape) that represents the system to model, in this case, the " Video Rental Store". The figure below shows a context Data Flow Diagram that is drawn for a video rental system. The Video Rental System Example Context DFD
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