• an external agent is a source if it is an origin of data coming into the system

• an external agent is a source if it is an origin of data coming into the system

• an external agent is a sink if it is a destination of data leaving the system

Process:

The tasks performed on the data is known as process. each process has a unique number and name.

• name each process using a verb and a noun phrase
• the name of a process should describe what the process does
• eg. calculate price ,check customer details ,accept supplier delivery

Data Flow:

Data Flow:

a data flow represents data in motion, moving from one place in the system to another.

The movement of data in the system is known as data flow. It is represented with the help of arrow. The tail of the arrow is source and the head of the arrow is destination.

name each data flow using a noun or noun phrase

• name each data flow using a noun or noun phrase


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