The biggest part of an application’s life starts when it’s first deployed in a production environment. Developing the first version may take a while, but once deployed, the application must be maintained and improved, typically for many years. Applications that are deployed and used by businesses and organizations need some form of maintenance over time, which means they need to be maintainable in the first place; that is, applications should be easy to develop and test during development, and afterward they should be easy to maintain. Organizations that can improve their business processes in small incremental steps when they see fit have an important advantage over their competitors.
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