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  •  Old system continues to run while the new system is installed; When there is confidence in new system, old system is retired.
  • Advantages: Accuracy of new system can be compared with legacy system; Can revert to old system if there is a problem ; Suitable for life/mission critical systems
  • Disadvantages: All work is duplicated; May not have space for 2 sets of physical equipment; May result in data integrity issues



Direct (Plunge or Big Bang)

  • The new system takes over from the old system immediately at a given time; Old system is retired immediately
  • Advantages: No risk of data integrity due to duplication; Cheap


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