In a software lifetime, type of maintenance may vary based on its nature. It may be just a routine maintenance tasks as some bug discovered by some user or it may be a large event in itself based on maintenance size or nature. Following are some types of maintenance based on their characteristics:

●      Corrective Maintenance – This includes modifications and updations done in order to correct or fix problems, which are either discovered by user or concluded by user error reports.

●      Adaptive Maintenance – This includes modifications and updations applied to keep the software product up-to date and tuned to the ever changing world of technology and business environment.

●      Perfective Maintenance – This includes modifications and updates done in order to keep the software usable over long period of time. It includes new features, new user requirements for refining the software and improve its reliability and performance.

●      Preventive Maintenance – This includes modifications and updations to prevent future problems of the software. It aims to attend problems, which are not significant at this moment but may cause serious issues in future.