DFDs can be
expressed as a series of levels. The outermost level (Level 0) is concerned
with how the system interacts with the outside world.
A context diagram can define as a graphical representation of a system which
deliberately does not go into defining processes. So it is a data flow diagram with only one massive central
process that subsumes everything inside the scope of the system.
It
is just to give an overview of a system without getting bogged down in detail. It is a top level data flow diagram.
Context diagram also known as Level 0. In Level0 the diagram does not contain
any Data stores..When drawing a context diagram there
are three symbols used in a context diagram such as circle, arrows and a
rectangle.
Circle
: Represent the system in terms of a single process,
Arrows
: Show data flow
Rectangle
: Show any external entities affecting the system.
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