A Level ICT Unit 5.6.3

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A Level ICT Unit 5.6.3

• Implementing CBISs

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Support

• Installing a new system is disruptive and the
  support program will need to be planned well in
  advance
• Training. Needs and provision will need to be
  identified. All users must know how to use the
  new software. Also, appropriate documentation
  must be provided.
• Training materials will help the user to use the
  system.
• User manuals and references are designed for when
  the user is familiar with the basics of the
  system but need to look up an unfamiliar task or
  procedure they havent used for a while. On line
  help may support this.
• Procedural documentation. Provides information
  about backup procedures, security controls and
  disaster management and recovery procedures.

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Support cont..

1. Existing files or paper based systems must be
   transferred to the new system. It might be
   possible to use software to convert the existing
   records to the format needed by the new system.
   If the existing system is paper based, the data
   will have to be entered manually.

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System Review

• This the process of observing how the system is
  operating and deciding whether the original
  performance specification is being met.
• A system review will arise either if there are
  problems with the system or if it has been pre
  planned (regular time intervals). The latter is
  more advantageous, as improvements can be planned
  without having an immediate problem to solve.
• Time planned reviews will be determined by the
  complexity of the system and how fast the needs
  of the organisation change. This could include
• System needs to store more data
• System needs to handle more customers
• System needs to provide a faster response time

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System Review Cont..

• The system might not be cost effective
• The system might not be able to use the latest
  telecommunication links.
• Operating procedures might have changed, so the
  documentation is out of date.
• The system review will identify
• Whether the system is still meeting performance
  targets
• Potential problem areas so that modifications can
  be planned before problems develop
• At the end of the review an action plan
  identifying a course of action should be
  produced. This will lead to system maintenance or
  the system life cycle starting over again.
  (Extreme case!).

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Maintenance

• Maintenance is needed when the system isnt
  operating properly or efficiently in some way. It
  might be needed immediately or planned as a
  result of a system review.
• Corrective maintenance is used when the system
  isnt working correctly. This type of maintenance
  fixes bugs in the system.
• Perfective maintenance makes the system work
  better. A procedure may be re-written, for
  example, reducing the computer response time.
• Adaptive maintenance is used when the needs of
  the organisation have changed. For example, the
  organisation has expanded so that the system can
  store sufficient data. It will also be necessary
  if the organisation has changed the way it works.

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Maintenance cont..

• Maintenance can be disruptive. The system might
  need to be taken off line. This might not be
  possible. In this case, there might have to be
  two separate computer systems, each capable of
  handling all operations.
• If one is taken off line for a while, the back up
  can take over all operations for a short time.
• This also provides security against the complete
  failure of one system.