5gh - Maintenance

5gh - Maintenance

1. Perfective

   • This will make a good system even better
   • This will not change the functionality of the system, only improve it

2. Adaptive

   • This will occur when the system requires new features to be built into it
   • Changes may be triggered from both internal and external sources
   • Internal
     • Changes to hardware
     • Changes to software
   • External
     • Changes to tax codes
     • Changes in legislation

3. Corrective

   • This takes place when problems with the system have been identified
   • It is usually resolved through patching the software
   • Programming errors
     • This is when the programmer has made a mistake when writing the system
     • The type of error should have been identified during testing
   • Logic errors
     • This is when the system seemed to work during testing, but it processes real world data slightly differently