Parallel, Old and new systems are used simultaneously., Provides fallback when new system fails, Causes cost overruns. New system may not get fair trail., Direct, New system is implemented and old system is replaced completely., Forces users to make new system work, No fall back if problems arise with new system, Pilot, Supports phased approach that gradually implement system across all users, Allows training and installation without unnecessary use of resources., A long term phasein causes a problem of whether conversion goes well or not., Phased, Working version of system implemented in one part of organization based on feedback, it is installed throughout the organization all alone or stage by stage., Provides experience and line test before implementation, Gives impression that old system is erroneous and it is not reliable..

Labelled Diagram. System Implementation

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