Extreme Programming (XP): The Engineering Side of Agile
Extreme Programming (XP) is the side of Agile that lives inside the code: test-first, pair programming, continuous integration, small releases, refactoring and collective code ownership form a system that supports itself. Scrum doesn't define these practices, and Fowler's Flaccid Scrum warning describes exactly that gap; with real output we show a pair writing Bookstore's free shipping rule test-first and getting it onto trunk in small commits within minutes.
8 Nov 2026
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8 min
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