System Changeover Methods

Old and new systems are run at the same time causing duplication of all tasks, while the new system is checked to ensure consistency.

• Phased

• Pilot

• Parallel

• Direct

Also known as the big bang changeover. Change to the new system immediately.

• Phased

• Pilot

• Parallel

• Direct

Initially, only part of the new system is deployed with the rest still on the old system. As the new parts are accepted the old is phased out.

• Phased

• Pilot

• Parallel

• Direct

The new system is rolled out to a self-contained branch before being rolled out to the rest.

• Phased

• Pilot

• Parallel

• Direct

With a parallel system if one fails, there is a __________.

This is the safest method of changeover.

• Phased

• Pilot

• Parallel

• Direct

This changeover method is reserved for critical systems.

• Phased

• Pilot

• Parallel

• Direct

This changeover method requires the old system to work with the new system.

• Phased

• Pilot

• Parallel

• Direct

With this changeover method only one branch is affected by any problems.

• Phased

• Pilot

• Parallel

• Direct

This changeover method is high risk if it fails.

• Phased

• Pilot

• Parallel

• Direct