Where possible, XP uses widely accepted vocabulary. Where there are concepts in XP that are significantly different from concepts elsewhere, we highlight the differences by using new words. Here are the most important words in the XP lexicon.
A test case that runs without any human intervention. The test checks to make sure the system calculates the expected values.
A role on the team for someone who watches the process as a whole and calls the team's attention to impending problems or opportunities for improvement.
A release and a date. The commitment schedule is refined one iteration at a time, and modified through reestimation and recovery.
A role on the team for choosing what stories ...