This is probably topic 1.1.8

Big Bang or direct implementation to give it a more formal description. As the name suggests, this means at a certain point in time you stop using one system and start using another.  Obviously this can cause problems if the new system does not work properly.  However, the changeover time is minimal. 

To ease the transition to the new system phased implementation might be used where different parts are introduced at different times.  When one part is working well, the next part is introduced. This is more time consuming and may require extra work for users during the transition.

A thorough test can be carried out by parallel running - having both the new and the old system working at the same time.  While this does mean that the new system can be thoroughly checked out it also means double the workload for staff during the implementation phase.

related: [ systems home | Systems Flow Charts | Fair Trade Scenario ]

[ previous: implementation | next: maintenance ]

There are three main ways of installing a new system.  It is not entirely clear from the subject guide that this is included but there have been past questions on the topic.

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