What does eXtreme programming emphasize in software development?

The correct choice focuses on continuous improvement through feedback, which is a fundamental principle of eXtreme Programming (XP). This methodology prioritizes customer collaboration and frequent iterations to refine and improve the software being developed. Regular feedback loops allow developers to understand user needs and make adjustments quickly, ensuring that the end product is more closely aligned with customer expectations.

In XP, practices such as pair programming, test-driven development, and continuous integration facilitate ongoing feedback and improvement. The emphasis is on delivering functional software in short cycles, promoting flexibility and responsiveness to change, which contrasts with a more rigid approach that would be suggested by the other options. This agile framework encourages adaptability and a strong commitment to quality independent of strict, linear project phases.