 During the life of any system, there may be times when certain maintenance needs to take place.  There are different forms of maintenance and each are carried out differently and for different reasons.  The types of maintenance checks you need to be aware of include: › Perfective › Adaptive › Corrective

 This type of maintenance occurs when a good system can be made even better.  For example: › Adding shortcut keys to speed up access time. › Improved user interface designs. › Increased levels of help. › Find quicker ways of performing the same tasks. › Restructuring of data to improve storage requirements.  Perfective maintenance does not change the functionality of the system...it only improves it.

 This type of maintenance occurs when the system requires some new features built into it.  Changes may be triggered from both internal and external sources.  Internal changes might be: › Changes to hardware/software.  External changes might be: › Changes in tax codes and the values that represents. › Changes in legislation.

 This maintenance takes place when problems with the system have been identified (aka errors/bugs).  There are two types of errors/bugs that might need to be fixed: › Programming errors:  This is when the programmer has made a mistake when writing the system. This type of error should have been identified during testing and fixed. › Logic errors:  This is when the system seemed to work during testing but it processes real world data slightly differently.  Corrective maintenance is usually resolved through patching the software.

 Describe each type of maintenance.  For each type of maintenance: › Identify a situation where it would be most appropriate to use it and explain why it is the most appropriate.