Fundamentals of Software Engineering
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Extreme Programming (XP) is a widely used agile methodology focused on iterative development through user stories, cost assessments, and planning for deliverable increments. It emphasizes principles like simplicity in design, continuous integration, pair programming, and daily execution of unit tests to enhance code quality and customer satisfaction. The methodology includes techniques such as CRC cards, spike solutions for difficult design issues, and refactoring to improve software design continuously.
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Fundamentals of Software Engineering
- 1. 1 Extreme Programming (XP) Model • The most widely used agile process, originally proposed by Kent Beck • XP Planning • Begins with the creation of “user stories” • Agile team assesses each story and assigns a cost • Stories are grouped to for a deliverable increment • A commitment is made on delivery date • After the first increment “project velocity” is used to help define subsequent delivery dates for other increments
- 2. 2 Extreme Programming (XP) • XP Design • Follows the KISS(Keep it Simple,Stupid) principle • Encourage the use of CRC cards (Class Responsibility Collaboration) • For difficult design problems, suggests the creation of “spike solutions”— a design prototype( A Working Model) • Encourages “refactoring”—an iterative refinement of the internal program design • XP Coding • Recommends the construction of a unit test for a store before coding commences • Encourages “pair programming” • XP Testing • All unit tests are executed daily • “Acceptance tests” are defined by the customer and executed to assess customer visible functionality
- 3. 3 Extreme Programming (XP) unit t est cont inuous int egrat ion accept ance t est ing pair programming Release user st ories values accept ance t est crit eria it erat ion plan simple design CRC cards spike solut ions prot ot ypes refact oring software increment project velocity computed