Topic 1.1.5

• Changeover is the process of putting the new system online and retiring the old one
• Parallel Changeover : Both systems work in parallel for a short period of time. When the business is satisfied with the output of the new system then the old system can be terminated. This method is expensive but low risk.
• Big Bang changeover : The new system replaces the old one immediately. It is pretty risky.
• Pilot Changeover : The new system is introduced to one of the sites of an organisation and if it performs well it is extended to the other sites. This method is low risk
• Phased Changeover : The company converts one module of the system at a time. This method is very time consuming