i m working on a store mgt project.'
wanted the know the imp of context diagrams.
and how can i know if m goin right.

Not sure what it is exactly you would like to gain knowledge in about Context Diagrams but i will give you a simple run down.

A circle represents the system and or processes, a square represents external entities, the two parallel lines represent data storage/results and the arrows quite obviously represent the direction of data flow :D

By external entities, it means groups of personnel. So lets say the system is a school, the external entities would include 'students', 'teachers' etc...

Hope it helped ;)