(25)What are data flow diagrams (DFD)?

Answer:

• Data Flow Diagrams (DFD) indicates the flow of data or information from one place to another. 
• DFD shows that how processes are linked together through data stores and how the processes are related to the users and the outside world.
• DFD provides an overview of :

−        What type of data is processed by system.

−        What types of transformations are performed.

−        What results are produced and where they flow.

−        What type of data is stored. 

•    In DFD, processes are identified to the function using “swinlanes”. Each lane is represented by process owner who is responsible for implementing appropriate controls and to mitigate the risks.