Eventual Business Consistency

Kent Beck:

The fundamental, inescapable problem? What is in the system is a flawed reflection of what is going on in reality. We want what is in the system to be as close as possible to reality, but we also need to acknowledge that consistency between the system & reality will only ever be approached, not achieved. The system will record changes in reality eventually, but by then we may have made decisions that need to be undone.