Timing and Versions
The Enterprise Specification is maintained throughout the lifetime of the system. If policies change, then these changes need to work through to the running system, often on precise time-scales.
- a pricing policy, or a tax structure may need to be introduced on a specific date;
- other development and maintenance will need to be carried out in parallel;
- recovery and back tracking need to be supported;
- need preparatory changes and dummy running;
- implies need for flexible build process and version control.