It also identifies internal data stores of Student, Employee, Publisher, Authors, Issue Book that must be present in order for the Library Management system to do its job, and shows the flow of data between the various parts of Library, Issue Book, Employee, Student, Publisher of the system.
First Level Data flow Diagram(1st Level DFD) of Library Management System :įirst Level DFD (1st Level) of Library Management 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 Library Management System system as a whole.
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