Extreme Programming (XP)
Extreme Programming (XP) is an agile software development framework that emphasizes technical excellence and engineering practices such as pair programming, test-driven development, continuous integration, and frequent releases.
Explanation
XP was created by Kent Beck in the late 1990s and is built around five values: communication, simplicity, feedback, courage, and respect. XP takes proven software engineering practices to extreme levels. For example, if code review is good, XP takes it to the extreme with pair programming. If testing is good, XP takes it to the extreme with test-driven development.
Key XP practices include pair programming, TDD, continuous integration, refactoring, simple design, collective code ownership, coding standards, sustainable pace, and small releases. These practices reinforce each other and create a disciplined approach to software development that produces high-quality code with minimal defects.
XP teams work in short iterations (typically one to two weeks) and deliver working software at the end of each iteration. XP places a strong emphasis on customer involvement, with an on-site customer providing rapid feedback and clarification. For the exam, understand XP as the most engineering-practice-focused agile framework.
Key Points
- •Five values: communication, simplicity, feedback, courage, and respect
- •Emphasizes engineering practices like pair programming, TDD, and CI
- •Short iterations of one to two weeks with frequent releases
- •Strong emphasis on technical excellence and customer involvement
Exam Tip
XP is the agile framework most focused on engineering practices. If a question asks about technical practices like TDD or pair programming, they originate from XP.
Frequently Asked Questions
Related Topics
Pair Programming
Pair Programming is an XP practice where two developers work together at one workstation, with one writing code (the driver) and the other reviewing each line in real time (the navigator).
Test-Driven Development (TDD)
Test-Driven Development (TDD) is a software development practice where developers write a failing test before writing the production code that makes it pass, following a red-green-refactor cycle.
Continuous Integration
Continuous Integration (CI) is the practice of frequently merging code changes into a shared repository, where automated builds and tests verify each integration to detect problems early.
Refactoring
Refactoring is the practice of restructuring existing code without changing its external behavior to improve its readability, reduce complexity, and make it easier to maintain.
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