Topic 10 - AQA INFO3 ICT

Introducing large ICT systems into organisations

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Changeover methods

  • Direct conversion - the original system is switched off and the new one is switched on.
  • Phased conversion - both systems run for a period of time 
  • Pilot conversion - the original system operates whilst parts of the company have a pilot conversion.
  • Parallel conversion - both systems run until the new system is deemed as being reliable. 
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Maintenance Methods

  • Corrective maintenance - fixes bugs such as system crashes that were not apparent during the project test phase.
  • Adaptive maintenance - enhances the system or take into account new client requirements.
  • Perfective maintenance - the manufacturer of the package adds new features for more efficient operation or usability. 
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