4.3.9 - SDLC - Systems Evaluation

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  • Created by: Annie
  • Created on: 13-05-13 18:27
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  • Systems Evaluation
    • This is a key part of developing future systems successfully, by learning from the good and bad points of developing the current system
      • Usually takes place after the new system has been used for a while
    • Criteria for systems evaluation (not definitive)
      • How well does the system match the original user requirements?
      • Ease of use
      • Does the system produce useful information promptly?
      • Is the new system running smoothly?
        • Was the testing effective?
        • Was there much corrective maintenance?
      • Is security effective?
    • Tools for compiling an evaluation report
      • Quantitative Tests
        • For example, whilst verbal evidence of "ease of use" may be interesting, it cannot be aggregated. So a scale of 1-5 to determine satisfaction levels may be more helpful
        • Measurable item
      • Error Logging
        • All errors noted need to be recorded in a log so they can be analysed by type and a summary provided
          • Corrective maintenance
      • Interviews
        • Interviews with key personnel can be used to determine how effective the system has been in meeting user requirements
      • Questionnaires
        • Whilst interviews are with a small number of people, questionnaires can be used to ensure all users have a say in the evaluation process
    • Methods of avoiding post implementation costs
      • Costs can include:
        • Training for the initial system
        • Adaptive, Corrective and Perfective changes
      • A log of these costs can help in reducing such costs for future systems.
        • Some of these costs are inevitable to some extent, so eliminating them is not possible
      • Training
        • Use CBT Training (computer based training)
      • Adaptive
        • Make it easy to change
          • Don't want to be employing a programmer to edit and disrupt the system


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