Feedback
Feedback is an Extreme Programming value:
We will take every iteration commitment seriously by delivering working software. We demonstrate our software early and often then listen carefully and make any changes needed. We will talk about the project and adapt our process to it, not the other way around.
Several practices are designed to increase feedback overall and reduce the feedback loop (the time between when an action is taken and when feedback on it is received). For example, pair programming provides more and faster feedback than scheduled code reviews, continuous integration provides faster feedback on integration problems than infrequent integration, and small releases provide rapid feedback from end users of working software.