Methodology : The Rational Statemate Approach : The Top-Down System Specification : Defining External Data-Sources / Sinks (System Level 0)

Defining External Data-Sources / Sinks (System Level 0)

The first thing the engineers must do when starting a systems design is to define the context diagram, as it is called in classic Structural Analysis (SA). The context diagram defines the system boundaries in terms of the interface to the external world.

Define the inputs and outputs to the system by answering the following questions:

At this stage, you should draw the data flows between the system boundary i.e., Top Activity, and the external activities.