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Changeover. Lecture 12 Change-Over Strategies for Implementation. BTEC HNC Systems Support Castle College 2007/8. 1. Lecture Objectives. We will discuss changeover and the risks associated to it Consider the benefits and drawbacks of each changeover strategy

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changeover

Changeover

Lecture 12

Change-Over Strategiesfor Implementation

BTEC HNC Systems Support Castle College 2007/8

1

lecture objectives
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

changeover strategies
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

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changeover strategies continued
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the more risks that could occur to the business, the longer the changeover the more likely the new system will become out-of-date.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

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changeover strategies continued5
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

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changeover strategies6
Changeover strategies

BTEC HNC Systems Support Castle College 2007/8

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direct changeover cut over
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

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parallel running
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

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piloting
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

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phased changeover
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

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risk of the changeover strategies
Risk of the changeover strategies

Shelley Cashman 6th Ed.

BTEC HNC Systems Support Castle College 2007/8

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evaluate the new system
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

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conclusion
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

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