A software development methodology adhering to a very iterative and incremental approach, Extreme Programming is intended to improve software quality and responsiveness to changing customer requirements. As a type of agile software development, it advocates frequent releases in short development cycles (timeboxing), which is intended to improve productivity and introduce checkpoints where new customer requirements can be adopted. XP consists of a number of integrated practices for developers and management – the original twelve practices of XP include Small Releases, On-site Customer, Sustainable Pace, Simple Design, Continuous IntegrationUnit Testing, Coding Conventions, Refactoring Mercilessly, Test-Driven Development, System Metaphor, Collective Code Ownership, and Pair Programming. Most successful Agile practitioners adopt some subset of XP practices, often in conjunction with Scrum.

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