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Changeover

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Changeover

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  1. Changeover Lecture 12 Change-Over Strategiesfor Implementation BTEC HNC Systems Support Castle College 2007/8 1

  2. Lecture Objectives • We will discuss changeover and the risks associated to it • Consider the benefits and drawbacks of each changeover strategy • Talk about what feedback is required BTEC HNC Systems Support Castle College 2007/8 2

  3. Changeover Strategies • When a business decides to changeover to a new system to replace a legacy one, if performed incorrectly could result in mass loss of data and potentially millions of pounds. • The risks that need to be considered are: • There are many bugs in the new system therefore data is lost, inaccurate data entered or the system is totally unworkable therefore loss of business will occur. • Staff have not been trained adequately enough to use the new system, resulting in bad customer service and again loss of data, inaccurate data entered or a totally unworkable system BTEC HNC Systems Support Castle College 2007/8 3

  4. Changeover Strategies continued • There are many risks that could occur as we have discussed, the changeover has to be planned with all aspects of the changeover considered. • The quicker the changeover the more risks that could occur to the business, the longer the changeover the more likely the new system will become out-of-date. BTEC HNC Systems Support Castle College 2007/8 4

  5. Changeover Strategies continued • There is a balance that has to be found in terms of changeover, the quicker the transfer over to a new system occurs depends on the type of business and the importance of the new system. • When a business decides to changeover from an old system to a new system there are four main changeover strategies that can be used: • Direct changeover • Parallel running • Piloting • Phased changeover BTEC HNC Systems Support Castle College 2007/8 5

  6. Changeover strategies BTEC HNC Systems Support Castle College 2007/8 6

  7. Direct Changeover (cut over) • Direct changeover involves more risk than other methods • It involves abandoning the old system on a certain date and beginning the new system • This can be done at the end of the financial year, or quarter period. • Often this is used when implementing new commercial software systems BTEC HNC Systems Support Castle College 2007/8 7

  8. Parallel Running • Easier to ensure the new system is working properly before abandoning the old system • Running both systems can place a burden on the operating environment • Only appropriate when both systems are performing similar tasks BTEC HNC Systems Support Castle College 2007/8 8

  9. Piloting • The group that tries out the new system first is called the Pilot site • The old system continues to work for the entire organisation • If the pilot site proves successful then the new system is fully implemented • Combination of direct and parallel methods BTEC HNC Systems Support Castle College 2007/8 9

  10. Phased Changeover • A part of the system is given to all users • Less expensive than full parallel method • The risk of failures is limited to the initial modules only • Only possible where system can be divided into logical segments or modules BTEC HNC Systems Support Castle College 2007/8 10

  11. Risk of the changeover strategies Shelley Cashman 6th Ed. BTEC HNC Systems Support Castle College 2007/8 11

  12. Evaluate the new system Once the changeover has been completed feedback is needed for the following areas: • Information system output (accuracy, completeness and timeliness) • User satisfaction • System reliability and maintainability • Hardware efficiency and performance • Effectiveness of support and training BTEC HNC Systems Support Castle College 2007/8 12

  13. Conclusion • We have discussed the risk of changeover • We have learned about each different changeover strategy • We have considered what feedback is required once the changeover is complete BTEC HNC Systems Support Castle College 2007/8 13