Learn in the textbookAgile Development and XP Practices
DefinitionExtreme Programming (エクストリームプログラミング) is the full name of XP, and both refer to the same development method.
ExplanationThe English name Extreme Programming carries the idea of pushing good development habits to the extreme. Its content is exactly the same as XP, so read either name as the same method.
Memory hookExtreme means going to the limit. The name reflects an attitude of carrying the basic habits all the way, with no shortcuts.