It may require more functionalities of Online Food Ordering to reach the necessary level of detail about the Online Food Ordering functioning. Second Level Data flow Diagram(2nd Level DFD) of Online Food Ordering System :ĭFD Level 2 then goes one step deeper into parts of Level 1 of Online Food Ordering. Processing Item records and generate report of all Item.Processing Category records and generate report of all Category.Processing Delivery records and generate report of all Delivery.Processing Payment records and generate report of all Payment.Processing Customer records and generate report of all Customer.Processing Order records and generate report of all Order.Processing Food records and generate report of all Food.Main entities and output of First Level DFD (1st Level DFD):
You will highlight the main functionalities of Online Food Ordering. DFD Level 1 provides a more detailed breakout of pieces of the 1st level DFD. It also identifies internal data stores of Item, Category, Delivery, Payment, Customer that must be present in order for the Online Food Ordering system to do its job, and shows the flow of data between the various parts of Food, Customer, Category, Item, Delivery of the system. First Level Data flow Diagram(1st Level DFD) of Online Food Ordering System :įirst Level DFD (1st Level) of Online Food Ordering System shows how the system is divided into sub-systems (processes), each of which deals with one or more of the data flows to or from an external agent, and which together provide all of the functionality of the Online Food Ordering System system as a whole.
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