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maintenance comparison table
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adaptive maintenance     maintenance1.6 - Software Engineering Projects          new capabilities for the user except the ability to operate the software in the changed environmentA 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     maintenance1.6 - Software Engineering Projects           A type of maintenance performed to correct a defect in software  
enhancement     maintenance1.6 - Software Engineering Projects           A type of maintenance performed to add a new capability to software  
perfective maintenance     maintenance1.6 - Software Engineering Projects           A type of maintenance that includes reengineering, and is sometimes applied more broadly to include enhancement  
reengineeringadding any new features for usersensuring that maintenance and evolution of software is done in a systematic wayaccurately forecasting how much time it will take either to develop a system, or to make a specific set of changesthe system more amenable to adding features in the futureundergoing development in its technology and techniquessoftware engineering11.2 - Software Process Modelsdeveloping completely new softwarethe translation of higher-level designs into particular programming languagessoftware projectslong-term coststo increase maintainability of a systemThe systematic activities involved in the design, implementation and testing of software to optimize its production and support refactoringmodifying software that has been already written - this is because software is normally continually changed over a period of years until it becomes obsoleteresources such as the time and money of the stakeholders, and the CPU-time and memory of computers 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(1) The application of a systematic, disciplined, quantifiable approach to the development, operation, maintenance of software; that is, the application of engineering to software. (2) The study of approaches as in (1)solving customers' problems
refactoring ensuring that maintenance and evolution of software is done in a systematic wayaccurately forecasting how much time it will take either to develop a system, or to make a specific set of changes undergoing development in its technology and techniquessoftware engineering11.2 - Software Process Modelsdeveloping completely new softwarethe translation of higher-level designs into particular programming languagessoftware projects  The systematic activities involved in the design, implementation and testing of software to optimize its production and supportreengineeringproject managementmodifying software that has been already written - this is because software is normally continually changed over a period of years until it becomes obsoleteresources such as the time and money of the stakeholders, and the CPU-time and memory of computers Changing part of the design; performed as part of reengineering(1) The application of a systematic, disciplined, quantifiable approach to the development, operation, maintenance of software; that is, the application of engineering to software. (2) The study of approaches as in (1)solving customers' problems

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