4. Diagrams

As part of the investigation process various diagrams will be created in order to help analyse the system.

System diagrams

These show the relationships between the various systems in the company (or even outside if relevant) - how they interact, what depends on what and so on.

Data Flow Diagrams

Most systems deal with information in one way or another. What really matters is how the information flows through the system.

Process diagrams

People handle information in a specific way - they have a 'process'. For example, an employee makes an expense claim. First of all their manager counter-signs the claim. It then goes to the account manager who authorises payment and so on.

A process diagram will try to show these processes in action.