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7468835
5d- Changeover and Installation
Description
A level, A2 IT (Chapter 5) Mind Map on 5d- Changeover and Installation, created by Gladys Mba on 27/01/2017.
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chapter 5
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chapter 5
a level, a2
Mind Map by
Gladys Mba
, updated more than 1 year ago
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Created by
Gladys Mba
over 7 years ago
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Resource summary
5d- Changeover and Installation
Direct (Plunge)
Old system runs until it is time for new system to be used
Old system immediately stopped and new system installed straight after
Data from old system transferred to new
Everyone starts using new system at the same time
Parallel
Date set for new system to go live
Old system continues to run as new system is being installed
For a period of time both systems are run in parallel
X- At this time data has to be entered into both systems in order for them to be up-to-date.
Old system retired once there is confidence in new system
Phased
Part of the new system are introduced one at a time
As one module is introduced in the new system, it's corresponding module in the old system is stopped.
X- The two systems have to be very compatible and have to share data easily.
Can be combined with parallel for each module
Pilot
A group is an organisation are exposed to the system before others in the organisation
Any problem with system or installation is identified and fix before full lance of system
Can be combined which phased and plot
O- Group used in pilot can help other when training using cascading waterfall model
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