First Level DFD (1st Level) of Social Networking Site shows how the system is divided into sub-systems (processes). It may require more functionalities of Social Networking to reach the necessary level of detail about the Social Networking functioning. Second Level Data flow Diagram(2nd Level DFD) of Social Networking Site :ĭFD Level 2 then goes one step deeper into parts of Level 1 of Social Networking.
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