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
Dev Maint Cost