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maintenance
subject			fact

maintenance	has definition In the context of software, any process involving modifying software following its general release to users
	is a subtopic of 1.6 - Software Engineering Projects
	is part of software engineering
	is a kind of process
process	see also process^2

Kinds of maintenance :

• adaptive maintenance (4 facts) - A type of maintenance performed to change software so that it will work in an altered environment, such as when an operating system, hardware platform, compiler, software library or database structure changes
• corrective maintenance (3 facts) - A type of maintenance performed to correct a defect in software
• enhancement (3 facts) - A type of maintenance performed to add a new capability to software
• perfective maintenance (3 facts) - A type of maintenance that includes reengineering, and is sometimes applied more broadly to include enhancement
• reengineering (12 facts) - A type of maintenance performed to improve the design of some part of a software system, in general so that it has higher maintainability. In general, no new features are added for users
• refactoring (5 facts) - Changing part of the design; performed as part of reengineering