Types of Software Maintenance

• Corrective maintenance

  • Fixing defects (“bugs”)
    • I.e. correcting design flaws

• Perfective maintenance

  • Improving the product (“enhancements”)
    • Because of new requirements
      • Or misunderstood requirement
    • Because of new technological opportunities
      • E.g. increased distribution of a centralized IS onto client-server architecture
    • Reflecting changes in the environment
      • Changes to tax laws, changes to ways of working, etc.
        • Or unanticipated changes

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