2. Modelling data and systems

People are very good at seeing patterns and relationship when they are presented in the form of pictures and diagrams. The next few techniques take advantage of this fact.

Diagrams can be used to

• Demonstrate the proposal to the client
• Show how the current system works
• Show how the new system works
• Demonstrate how data flows in and out of the system
• Visually show how processes interact
• Act as a guide to the development of the system
• Become part of the documentation for the system.

Quite a handy list!