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Kent Beck

XP is about the engineering principles currently used in many agile organisations. Kent Beck had to “pack” these principles under some more technical “tools” and processes in order to sell them, like:

  • pair programming
  • tdd
  • spikes
  • iterative development

XP as a first-class citizen failed in the industry because, according to Beck, it was too much geared towards programmers (1st edition of his Book), and it didn't create an industry (for instance for “agile coaches”).