Explanation:
In phased changeover approach, the older system is broken into deliverables modules. Initially, the first module of older system is phased out using the first module of a new system. Then, the second module of the newer system is phased out, using the second module of the newer system and so forth until reaching the last module.
Some of the risk areas that may exist in the phased changeover area includes:
Resource challenge
Extension of the project life cycle to cover two systems.
Change management for requirements and customizations to maintain ongoing support of the older systems.
Changeover refers to an approach to shift users from using the application from the existing (old) system to the replacing (new) system.
Changeover to newer system involves four major steps or activities
Conversion of files and programs; test running on test bed
Installation of new hardware, operating system, application system and the migrated data.
Training employees or user in groups
Scheduling operations and test running for go-live or changeover
Some of the risk areas related to changeover includes:
Asset safeguarding
Data integrity
System effectiveness
Change management challenges
Duplicate or missing records
The following were incorrect answers:
Parallel changeover – This technique includes running the old system, then running both the old and new systems in parallel and finally full changing over to the new system after gaining confidence in the working of new system.
Abrupt changeover – In the abrupt changeover approach the newer system is changed over from the older system on a cutoff date and time, and the older system is discontinued once changeover to the new system takes place.
Pilot changeover – Not a valid changeover type.
Reference:
CISA review manual 2014 Page number 172