Reusability

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See 4.2.3.2 Reusability

Reusability is the use of existing assets in some form within the software product development process; these assets are products and by-products of the software development life cycle and include code, software components, test suites, designs and documentation. The opposite concept of Reusability is leverage, which modifies existing assets as needed to meet specific system requirements. Because reuse implies the creation of a separately maintained version of the assets[clarification needed], it is preferred over leverage.

Source: https://en.wikipedia.org/wiki/Reusability