There are four approaches/methods used to replace an old accounting information system with the new one. Describe the four approaches and identify the situations where each approach may be most appropriate/desirable to use.
a) Direct Changeover: The user stops using the old system one particular day and starts using the new system from thereon, usually over a weekend or during a slack period
b) Parallel Conversion: The old system continues alongside the new system for a few weeks or months
c) Phased Conversion: Used with larger systems that can be broken down into individual modules which can be implemented separately at different times.
d) Pilot Conversion: New system will first be used by only a portion of the enterprise, for example at one branch or factory
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