Main entities and output of First Level DFD (1st Level DFD): You will highlight the main functionalities of Railway Reservation. DFD Level 1 provides a more detailed breakout of pieces of the 1st level DFD. It also identifies internal data stores of Payment, Customer, Train Route, Train Shedule, Ticket that must be present in order for the Railway Reservation system to do its job, and shows the flow of data between the various parts of Trains, Ticket, Customer, Payment, Train Route of the system. First Level Data flow Diagram(1st Level DFD) of Railway Reservation System :įirst Level DFD (1st Level) of Railway Reservation 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 Railway Reservation System system as a whole.
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