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Draw a data flow diagram to graphically represent the following system

Draw a context-level DFD to depict the typical user authentication process used by any system. An user gives two inputs -- user name and password.

Table #1: Add external entity Table #2: Add process Table #3: Add data store Table #4: Add data flows

Type (P/DS/EE)	From	Data Label	Type (P/DS/EE)	To	Add

Table #5: List of external entities, data stores, and processes Table #6: List of data flows

DFD for a Social Networking site

The Absolute Beginners Inc. is planning to launch a revolutionary social networking site, EyeCopy. You have been entrusted with designing a DFD for the proposed application. In particular, you have been asked to show the following scenarios:

User registration
User login
Profile update

Draw a Level 1 DFD to depict the above data flow and the corresponding processes. Should there be any data store in the DFD?

Table #1: Add external entity Table #2: Add process

Process (P)	Level	Add

Table #3: Add data store

Data Store (DS)	Add

Table #4: Add data flows

Type (P/DS/EE)	From	Data Label	Type (P/DS/EE)	To	Add

Table #5: List of external entities, data stores, and processes Table #6: List of data flows

Solution