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To maintain software quality once it is deployed, developers must constantly adapt it to meet new customer requirements and handle problems customers identify. This includes improving functionality, fixing bugs and adjusting software code to prevent issues. How long a product lasts on the market depends on developers' ability to keep up with these maintenance requirements.

When it comes to performing maintenance, there are four types of changes developers can make, including:
  • Corrective
    Users often identify and report bugs that developers must fix, including coding errors and other problems that keep the software from meeting its requirements.
  • Adaptive
    Developers must regularly make changes to their software to ensure it is compatible with changing hardware and software environments, such as when a new version of the OS comes out.
  • Perfective
    These are changes that improve system functionality, such as improving the user interface or adjusting software code to enhance performance.
  • Preventive
    These changes are done to keep software from failing and include tasks such as restructuring and optimizing code.
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