G10 REVISION Ch 7 Systems Lifecycle: Implementation

The new system is gradually introduced. When parts of the new system are working at a satisfactory level then more elements of the system are phased in.

Eventually the old system will be phased out over a period of time.

• Direct Changeover

• Phased Implementation

• Pilot Running

• Parallel Running

The existing system is stopped and replaced by the new system immediately

• Direct Changeover

• Phased Implementation

• Pilot Running

• Parallel Running

The new system is trialed in a department of the organisation, and if the system is successful, then it will be implemented across all departments.

• Direct Changeover

• Phased Implementation

• Pilot Running

• Parallel Running

In this method of changeover, the existing and the new system work together for a period of time until the new system fully takes over.

• Direct Changeover

• Phased Implementation

• Pilot Running

• Parallel Running

In this method of changeover, it is time consuming as every part of the system which is implemented needs to be evaluated.

• Direct Changeover

• Phased Implementation

• Pilot Running

• Parallel Running

In this method of changeover, tasks are not duplicated, costs are reduced as only one system is being used.

• Direct Changeover

• Phased Implementation

• Pilot Running

• Parallel Running

In this method of changeover, if the new system does the meet the requirements then the old system is still available as both systems are working together.

• Direct Changeover

• Phased Implementation

• Pilot Running

• Parallel Running

In this method of changeover, if a part of the new system does not meet the requirements, then you can always go back to the point of the system which was working.

• Direct Changeover

• Phased Implementation

• Pilot Running

• Parallel Running

In this method of changeover, if the new system does not meet the requirements, then only one department where it is implemented is affected and not the entire organization.

• Direct Changeover

• Phased Implementation

• Pilot Running

• Parallel Running

Tick which component has a / have

High Impact on parallel changeover.

• Relative cost of each method.

• Input needed by user

• Input needed by the system team

• Impact of failure of method.