Dev Maint Cost

Budgetary constraints can limit the number and types of modifications made to an existing program -- a given degree of speedup is worth only so much time and trouble.

---

SoftwareMaintenance

• Maintenance can be defined as four activities:
  • Corrective Maintenance
    • A process that includes diagnosis and correction of errors.
  • Adaptive Maintenance
    • Activity that modifies software to properly interface with a changing environment (hardware and software).
  • Perfective Maintenance
    • Activity for adding new capabilities, modifying existing functions and making general enhancements.
    • This accounts for the majority of all effort expended on maintenance.
  • Proactive Maintenance (Relatively Rare)
    • Activity which builds software keeping in mind future maintainability or reliability
    • Ensuring that a basis exists which allows for future enhancements.
• http://hebb.cis.uoguelph.ca/~dave/27320/quality/maintain.html