eXtreme Programming

Extreme Programming (XP) is a software development approach that emphasizes simplicity, discipline, communication, quality, and flexibility.

The most important XP rules :

• Business and development cooperate to produce the maximum business value as rapidly as possible.
• Release early and often, adding a few features each time.
• Each project has an organizing metaphor, which provides an easy to remember naming convention.
• Use as simple design as possible to implement only needed features.
• XP teams focus on validation of the software at all times. Programmers develop software by writing tests first.
• All changes are integrated into the codebase at least daily. The unit tests have to run 100% both before and after integration.