Few days ago at work, I had to fulfill a document where I had to select a type of software maintenance that I was going to apply.
The fact was I had only two choices, it seemed to me very weird because during my degree I studied 3 or 4 kinds of software maintenance.
Today I have found my Software Engineering class notes, then the types of Software Maintenance sorted descending by percentage of time spent:
|Perfective:||Activities to improve or add new functionalities required by the user.|
|Adaptative:||Activities to adapt the system to technological environment changes (hardware or software).|
|Corrective:||Fix defects in hardware or software detected by user running the production system.|
|Preventive:||Activities to ease the future system maintenance.|